Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
phan cau » phan dau, phan cac, phan tu
van cham » van chat, van tham, va cham
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
cuu va » cuu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach ty)) lang xa hoi. hieu van cham ((cuu va) OR (cuu ve)) thanh phan cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach ty)) lang xa hoi. hieu van cham ((cuu va) OR (cuu ve)) thanh phan cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (sach ty)) lang xa hoi. hieu van cham ((cuu va) OR (cuu ve)) thanh phan cau treo".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach ty)) lang xa hoi. hieu van cham ((cuu va) OR (cuu ve)) thanh phan cau treo*.