Perhaps you should try some spelling variations:
"toc sach phap ngu - goc nhin moi viet" » "toc sach phat ngu - goc nhin moi viet", "toc sach tham ngu - goc nhin moi viet", "toc cach pha ngu - goc nhin moi viet", "hoc sach phap ngu - goc nhin moi viet", "doc sach phap ngu - goc nhin moi viet", "thuoc sach phap ngu - goc nhin moi viet", "toc sach nhat ngu - goc nhin moi viet", "toc sach han ngu - goc nhin moi viet", "toc sach phap tu - goc nhin moi viet", "toc sach phap ngu - goc nhiem moi viet", "toc sach phap ngu - goc thien moi viet", "toc sach phap ngu - goc khien moi viet", "toc sach phap ngu - goc nhin muoi viet", "toc sach phap ngu - goc nhin mai viet", "toc sach phap ngu - goc nhin moi viec"
"te sach nha tu - goc nhin so viet" » "te sach nha tu - goc khien so viet", "te sach nha tu - goc nhin hoc viet", "te sach nhat tu - goc nhin so viet", "te sach nhanh tu - goc nhin so viet", "te sach nghia tu - goc nhin so viet"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach nha tu - goc nhin so viet") OR ("toc sach phap ngu - goc nhin moi viet"))~.
• Removing quotes may allow a broader search: (( te sach nha tu - goc nhin so viet ) or ( toc sach phap ngu - goc nhin moi viet ))~.
• Adding a wildcard symbol may retrieve word variants: (("te sach nha tu - goc nhin so viet") or ("toc sach phap ngu - goc nhin moi viet"))*.