Perhaps you should try some spelling variations:
khang kho » khong kho, khong khoa, hang khoa
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu van » hieu va, thien van, lieu va
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
van cac » van hac, van cau, van bac
tang xa » trang xa, tang ma, lang xa
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((khach kho) OR (khang kho)) tang xa hoi. hieu van cac nuoc ((va hanh) OR (va danh)) de cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((khach kho) OR (khang kho)) tang xa hoi. hieu van cac nuoc ((va hanh) or (va danh)) de cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu ((khach kho) OR (khang kho)) tang xa hoi. hieu van cac nuoc ((va hanh) or (va danh)) de cua tre*.