Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
thanh tai » thanh hai, thanh toan, doanh tai
cham cuu » cap cuu, chat cua
sach thu » sach thue, sach thieu, sach tham
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, xach tay
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
cuu va » cuu van, cuu ve
ma hoi » mai hoi, xa hoi, ma hoa

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 ty) OR (sach thu)) nang ma hoi. hieu ve cham cuu va ((thanh phan) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) nang ma hoi. hieu ve cham cuu va ((thanh phan) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach thu)) nang ma hoi. hieu ve cham cuu va ((thanh phan) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach thu)) nang ma hoi. hieu ve cham cuu va ((thanh phan) or (thanh tai)) cua tre*.