Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cao tang » cao dang
chat huu » pham huu
cuu tre » cau tren, cau treo
va chat » van chat, va phat, cao chat
cua tre » cua te, cua triet, dua tren
huu van » cuu van, huu han, luu van
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ((kho tang) or (cao tang)) ma hoi. hieu va chat huu van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ((kho tang) OR (cao tang)) ma hoi. hieu va chat huu van hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sai ((kho tang) or (cao tang)) ma hoi. hieu va chat huu van hanh vi ((cua tre) or (cuu tre))*.