Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
vai cua » dai cua, hai cua, lai cua
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
cua cau » cua cac, cua chu, cua cay
hieu va » lieu va, hieu qua
cho hoc » co hoc, khoa hoc
ban cho » ban cheo, bang cho, ban co
thu ban » thu hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thu ban cho hoc. ((((hieu ve) or (hieu van))) or (hieu va)) cac luc van hanh vai cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thu ban cho hoc. ((((hieu ve) OR (hieu van))) OR (hieu va)) cac luc van hanh vai cua cau*.