Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
hieu cua » hieu qua, dieu cua, bieu cua
ca viet » va viet, co viet, hoa viet
ang xa » lang xa, mang xa, dang xay
lo van » le van, vo van, so van
tai ca » tai cac, tai cao, tai cua
lo va » lao va, ly va, le va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y ang xa hoi. hieu cua cac ((lo va) or (lo van)) thanh tai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ang xa hoi. hieu cua cac ((lo va) OR (lo van)) thanh tai ca viet.
• Adding a wildcard symbol may retrieve word variants: hoc sach y ang xa hoi. hieu cua cac ((lo va) or (lo van)) thanh tai ca viet*.