Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su sach » so sach, vu sach
hoc van » hoc dan, hoc va, hoc vat
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
te sach » toc sach
va cau » van cau, va cac, va dau
va chu » va che, va chi
ve cao » va cao, ve bao, ve cac

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

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