Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thanh tai » thanh hai, doanh tai, thanh san
te sach » toc sach
bao luc » bao thuc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
luc va » duc va, tuc va, loc va
ve bao » te bao, va bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((nang ma) or (sang ma)) hoi. hieu ve bao luc va ((thanh tai) OR (thanh toan)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (sang ma)) hoi. hieu ve bao luc va ((thanh tai) OR (thanh toan)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang ma) or (sang ma)) hoi. hieu ve bao luc va ((thanh tai) OR (thanh toan)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) or (sang ma)) hoi. hieu ve bao luc va ((thanh tai) OR (thanh toan)) cuu tre*.