Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
tao hoi » tao khoi, tao boi, thao hoc
tay hoi » tay ho, tay thai
cam luc » cam xuc, cau luc
dan vi » doan vi, don vi, dan va
va dan » ca dan, va dao, va dau
luc va » duc va, tuc va, loc va
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
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 sac ky sang ((tao hoi) or (tay hoi)). ((hieu ve) or (hieu qua)) cam luc va dan vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky sang ((tao hoi) OR (tay hoi)). ((hieu ve) OR (hieu qua)) cam luc va dan vi cua vat.
• Adding a wildcard symbol may retrieve word variants: te sac ky sang ((tao hoi) or (tay hoi)). ((hieu ve) or (hieu qua)) cam luc va dan vi cua vat*.