Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
cac tren » ca tren, cau tren, rac tren
dang mat » dang vat, dang mau, dung mat
dang ma » dang mau, dang mam, tang ma
tai cac » tai cuc
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc 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 ((dang ma) or (dang mat)) hoi. hieu ve cam ((luc va) or (duc va)) thanh tai cac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((dang ma) OR (dang mat)) hoi. hieu ve cam ((luc va) OR (duc va)) thanh tai cac tren.
• Adding a wildcard symbol may retrieve word variants: hoc sach y ((dang ma) or (dang mat)) hoi. hieu ve cam ((luc va) or (duc va)) thanh tai cac tren*.