Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
hieu van » thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
cam luc » cam xuc, cau luc
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
luc va » duc va, tuc va, loc va
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky sang ma hoi. ((((hieu ve) or (hieu van))) or (hieu va)) cam luc va thanh tai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky sang ma hoi. ((((hieu ve) OR (hieu van))) OR (hieu va)) cam luc va thanh tai cua vat.
• Adding a wildcard symbol may retrieve word variants: tu bai ky sang ma hoi. ((((hieu ve) or (hieu van))) or (hieu va)) cam luc va thanh tai cua vat*.