Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu ban » thu hang
hanh va » hang va, hanh vi
loc van » luoc van, hoc van, lo van
cac loc » cac lop, cac toc, cac hoc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
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) or (hieu qua)) cac loc van 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) OR (hieu qua)) cac loc van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu ban) or (tu ban)) ky nang ma hoi. ((hieu va) or (hieu qua)) cac loc van hanh va cua tre*.