Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu va » lieu va, hieu qua
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
cac lop » cac loai
cuu tre » cua tre, cau tren, cau treo
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
tu ban » thu ban, te ban
tu san » thu san, tu can, vu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) or (tu ban)) ky sang ma hoi. hieu va ((cac lop) or (cac hop)) va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu ban)) ky sang ma hoi. hieu va ((cac lop) OR (cac hop)) va hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (tu ban)) ky sang ma hoi. hieu va ((cac lop) or (cac hop)) va hanh vai cuu tre*.