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
sach ty » sach y, sach tu, sach thu
ca viet » va viet, co viet, hoa viet
ty ang » ty xang, ty hang, ty anh
ang xa » lang xa, mang xa, dang xay
tai ca » tai cac, tai cao, tai cua
co va » do va, so va, cu 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 ty ang xa hoi. hieu cua cac ((co va) OR (co ma)) thanh tai ca viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty ang xa hoi. hieu cua cac ((co va) OR (co ma)) thanh tai ca viet".
• Adding a wildcard symbol may retrieve word variants: hoc sach ty ang xa hoi. hieu cua cac ((co va) OR (co ma)) thanh tai ca viet*.