Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cau treo » cau theo, cau tren, cau triet
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
te sach » toc sach
van cac » van hac, van cau, van bac
duc ban » duc tan, dua ban, duc man
hang x » nang x, hoang xa, chang xu

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 thu hang x ho. hieu van cac ((duc ban) OR (duc van)) thanh dai ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu hang x ho. hieu van cac ((duc ban) OR (duc van)) thanh dai ((cua tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu hang x ho. hieu van cac ((duc ban) OR (duc van)) thanh dai ((cua tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: te sach thu hang x ho. hieu van cac ((duc ban) OR (duc van)) thanh dai ((cua tre) or (cau treo))*.