Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh tai » thanh tai, hang tai, han tai
cac truc » cau truc, cac tru, cac trung
duc tien » duc thien, luc tieng, thuc tien
ly quang » le quang, vu quang
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
tai duc » tai cuc, mai duc, tai du
hieu va » hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ly hang) or (ly quang)) xa hoi. ((hieu va) or (lieu va)) cac truc va hanh tai duc tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ly hang) OR (ly quang)) xa hoi. ((hieu va) OR (lieu va)) cac truc va hanh tai duc tien.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ly hang) or (ly quang)) xa hoi. ((hieu va) or (lieu va)) cac truc va hanh tai duc tien*.