Perhaps you should try some spelling variations:
thu ban » thu hang
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cac lop » cac hop, cac loai
hieu va » lieu va, hieu qua
cac loc » cac toc, cac hoc, cac nuoc
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
tu ban » te ban
va cua » va chua, via cua, ca cua

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

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