Perhaps you should try some spelling variations:
"te sach han ngu - ngoc chien so viet" » "te sach han ngu - cuoc chien so viet", "te sach han ngu - ngoc lien so viet", "te sach tham ngu - ngoc chien so viet", "te sach danh ngu - ngoc chien so viet", "te sach dao ngu - ngoc chien so viet", "te sach han ngu - ngoc chien si viet", "te sach han ngu - ngoc khien so viet", "te sach han ngu - ngoc bien so viet", "toc sach han ngu - ngoc chien so viet", "te sach nhat ngu - ngoc chien so viet", "te sach han ngu - ngoc chien hoc viet"
"thu sach nang ngu - goc nhin nu viet" » "thu cach mang ngu - goc nhin nu viet", "thu sach dung ngu - goc nhin nu viet", "thu sach danh ngu - goc nhin nu viet", "tu sach nang ngu - goc nhin nu viet", "thuat sach nang ngu - goc nhin nu viet", "thuoc sach nang ngu - goc nhin nu viet", "thu sach nang nga - goc nhin nu viet", "thu sach nong ngu - goc nhin nu viet", "thu sach nang nguoi - goc nhin nu viet", "thu sach nang ngu - goc nhin tu viet", "thu sach nang ngu - goc nhin cau viet", "thu sach nang ngu - goc nhin ngu viet", "thu sach nang ngu - goc nhin su viet"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("te sach han ngu - ngoc chien so viet") or ("thu sach nang ngu - goc nhin nu viet"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach han ngu - ngoc chien so viet") OR ("thu sach nang ngu - goc nhin nu viet")).
• Removing quotes may allow a broader search: (( te sach han ngu - ngoc chien so viet ) or ( thu sach nang ngu - goc nhin nu viet )).
• Adding a wildcard symbol may retrieve word variants: (("te sach han ngu - ngoc chien so viet") or ("thu sach nang ngu - goc nhin nu viet"))*.