Perhaps you should try some spelling variations:
thu ban » thu hang
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
ban ky » van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
cac lo » cac lop, cac co, cac bo

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