Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
cham xuc » cam xuc, chat xuc, pham duc
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
cua nuoc » cua quoc, cua nguoi, cua thuoc
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua

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 ty dang xay hoi. hieu va ((cham xuc) or (cham soc)) van hanh tai cua nuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty dang xay hoi. hieu va ((cham xuc) OR (cham soc)) van hanh tai cua nuoc.
• Adding a wildcard symbol may retrieve word variants: toc sach ty dang xay hoi. hieu va ((cham xuc) or (cham soc)) van hanh tai cua nuoc*.