Perhaps you should try some spelling variations:
tham luc » than luc, tham nuoc, tham thuc
vanh dai » van dai, vanh tai, lanh dao
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va vanh » va van, va danh, va hanh
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky ((nang x) or (tang ma)) hoi. hieu va tham luc va vanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky ((nang x) OR (tang ma)) hoi. hieu va tham luc va vanh dai cua te*.