Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cau tren » cu tren, dau tren, ca tren
sach thi » sach thu, sach tai, sach thieu
xa thanh » va thanh, ha thanh, ta thanh
cham tuc » nham thuc, pham thuc, tham thuc
cuu tre » cua tre, cau treo
so sach » so sanh, bo sach, co sach
ve cham » va cham, ve chat, vu cham
hang ca » hang va, nang cao, hang tai
hang xa » hoang xa, hang va, lang xa
hieu ve » hieu va, hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thi ((hang xa) OR (hang ca)) hoi. hieu ve cham tuc xa thanh tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thi ((hang xa) OR (hang ca)) hoi. hieu ve cham tuc xa thanh tai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thi ((hang xa) OR (hang ca)) hoi. hieu ve cham tuc xa thanh tai ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: so sach thi ((hang xa) OR (hang ca)) hoi. hieu ve cham tuc xa thanh tai ((cuu tre) or (cau tren))*.