Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
cac tuc » cac toc, cac tu, cac tac
cua tre » cua te, cuu tre, cua triet
xa danh » va danh, dia danh, nam danh
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac

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 y ((nang xa) or (nang cao)) hoi. hieu van cac tuc xa danh vai ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (nang cao)) hoi. hieu van cac tuc xa danh vai ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (nang cao)) hoi. hieu van cac tuc xa danh vai ((cua tre) or (cau treo))*.