Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
hanh lai » hanh lam, hanh tai, thanh lap
cac toi » cac thoi
su viet » so viet
cac tuc » cac toc, cac tu, cac tac
hanh ca » hanh cac, hanh cat, hanh cua
ca hoi » cau hoi, cua hoi, xa hoi

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 thi hanh ca hoi. lieu va ((cac tuc) or (cac toi)) xa ((hanh lai) or (thanh san)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach thi hanh ca hoi. lieu va ((cac tuc) OR (cac toi)) xa ((hanh lai) OR (thanh san)) su viet.
• Adding a wildcard symbol may retrieve word variants: hoc sach thi hanh ca hoi. lieu va ((cac tuc) or (cac toi)) xa ((hanh lai) or (thanh san)) su viet*.