Perhaps you should try some spelling variations:
sang tay » sang tao, sang tai, sang tac
hieu van » thien van, hieu ve
te sach » toc sach
cam luc » cam xuc, cau luc
ky sang » ky nang, ky dang, ky tang
tay hoi » tay ho, tao hoi, tay thai
danh vi » hanh vi, dinh vi, danh di
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
hieu va » hieu qua
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: te sach ky sang tay hoi. ((((hieu van) OR (lieu va))) or (hieu va)) cam luc va danh 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 (lieu va))) OR (hieu va)) cam luc va danh 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 (lieu va))) or (hieu va)) cam luc va danh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach ky sang tay hoi. ((((hieu van) OR (lieu va))) or (hieu va)) cam luc va danh vi cua vat*.