Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tang tao » sang tao, tang tai, nang tao
hieu van » thien van, lieu va
cam luc » cam xuc, cau luc
ky tang » ky nang, ky dang, kho tang
tao hoi » tao khoi, tao boi, tay hoi
danh vi » hanh vi, dinh vi, danh di
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
luc va » duc va, tuc va, loc va
vi cua » vai cua, di 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 ky tang tao hoi. ((((hieu ve) or (hieu van))) or (hieu va)) cam luc va danh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky tang tao hoi. ((((hieu ve) OR (hieu van))) OR (hieu va)) cam luc va danh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: toc sach ky tang tao hoi. ((((hieu ve) or (hieu van))) or (hieu va)) cam luc va danh vi cua vat*.