Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, tu cach
hoc van » hoc dan, hoc va, hoc vat
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc, chat hoc
xang xa » lang xa, mang xa, ang xa
te sach » toc sach
ve cao » va cao, ve bao, ve cac
va cau » van cau, va cac, va dau
va chu » va che, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ty xang xa hoi. hieu ve cao hoc van hanh ((va cau) or (va chu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty xang xa hoi. hieu ve cao hoc van hanh ((va cau) OR (va chu)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ty xang xa hoi. hieu ve cao hoc van hanh ((va cau) or (va chu)) tre*.