Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
nam truc » nam truoc, nam thuc, nam trung
dang hai » dang khai, hang hai, dung hai
mai khoi » mai khoa, tai khoa, cac khoi
hieu van » hieu va, thien van, lieu va
hai cau » hai chau, hai chu, hai hau
va dang » van dang, va nang, va lang
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nam tuc » nam thuc, nam tu, nam thuoc

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 ly nang ((xa hoi) or (mai khoi)). hieu van ((nam tuc) or (nam truc)) va dang hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly nang ((xa hoi) OR (mai khoi)). hieu van ((nam tuc) OR (nam truc)) va dang hai cau treo.
• Adding a wildcard symbol may retrieve word variants: so sach ly nang ((xa hoi) or (mai khoi)). hieu van ((nam tuc) or (nam truc)) va dang hai cau treo*.