Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac lop » cac hop, cac loai
cac loc » cac toc, cac hoc, cac nuoc
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
thu ban » thu hang
ma hoi » mai hoi, xa hoi, ma hoa
tu san » thu san, tu ban, tu can

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 (thu ban)) ky sang ma hoi. hieu va ((cac loc) OR (cac lop)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (thu ban)) ky sang ma hoi. hieu va ((cac loc) OR (cac lop)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (thu ban)) ky sang ma hoi. hieu va ((cac loc) OR (cac lop)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (thu ban)) ky sang ma hoi. hieu va ((cac loc) OR (cac lop)) va hanh vai cua tre*.