Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
tu ban » thu ban, te ban
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
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 ((nang ma) OR (tang ma)) hoi. hieu va cac luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu ban)) ky ((nang ma) OR (tang ma)) hoi. hieu va cac luc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (tu ban)) ky ((nang ma) OR (tang ma)) hoi. hieu va cac luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (tu ban)) ky ((nang ma) OR (tang ma)) hoi. hieu va cac luc va hanh vi cua tre*.