Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
toc sach » hoc sach, doc sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
cau treo » cau theo, cau tren, cau triet
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky tang xa hoi. hieu van cham ((duc va) or (duc manh)) thanh van ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky tang xa hoi. hieu van cham ((duc va) OR (duc manh)) thanh van ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky tang xa hoi. hieu van cham ((duc va) or (duc manh)) thanh van ((cua tre) or (cau treo))*.