Perhaps you should try some spelling variations:
cau triet » cau trieu, cua triet, va triet
su triet » su viet, su tien, ve triet
dang hai » dang khai, hang hai, dung hai
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, cam tu, nam thuc
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
van cam » van nam, van lam, van cau
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, ma hoa, me hoi

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 ((ma hoi) or (xa hoi)). hieu van cam tuc va dang hai ((cau triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly nang ((ma hoi) OR (xa hoi)). hieu van cam tuc va dang hai ((cau triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly nang ((ma hoi) or (xa hoi)). hieu van cam tuc va dang hai ((cau triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ly nang ((ma hoi) or (xa hoi)). hieu van cam tuc va dang hai ((cau triet) OR (su triet))*.