Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
thanh hang » thanh hoang, thanh thang, tranh hang
nhung vung » nhung dung, nhung huong, nhung tuong
hanh hang » hang hang, hanh han, hanh mang
vung manh » hung manh, tung manh, vung lanh
manh toan » thanh toan, anh tuan, tinh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (chiet tach)) - ((hanh hang) OR (thanh hang)) va nhung vung manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - ((hanh hang) OR (thanh hang)) va nhung vung manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chiet tach)) - ((hanh hang) OR (thanh hang)) va nhung vung manh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - ((hanh hang) OR (thanh hang)) va nhung vung manh toan ban*.