Perhaps you should try some spelling variations:
sang tay » sang tao, sang tai, sang tac
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
cam luc » cam xuc, cau luc
danh vi » dinh vi, danh di, danh va
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
tay hoi » tay ho, tao hoi, tay thai
ky sang » ky nang, ky dang, ky tang
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky sang tay hoi. ((hieu van) or (hieu va)) cam luc va ((danh vi) OR (hanh vi)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang tay hoi. ((hieu van) OR (hieu va)) cam luc va ((danh vi) OR (hanh vi)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky sang tay hoi. ((hieu van) or (hieu va)) cam luc va ((danh vi) OR (hanh vi)) cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach ky sang tay hoi. ((hieu van) or (hieu va)) cam luc va ((danh vi) OR (hanh vi)) cua vat*.