Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
cam thuc » nam thuc, cam thu, can thuc
minh hai » minh khai, tinh hai, manh hai
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
va minh » van minh, vua minh, va kinh
hai cau » hai chau, hai chu, hai hau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang xa hoi. ((hieu van) or (thien van)) ((cam thuc) OR (am thuc)) va minh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang xa hoi. ((hieu van) OR (thien van)) ((cam thuc) OR (am thuc)) va minh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang xa hoi. ((hieu van) or (thien van)) ((cam thuc) OR (am thuc)) va minh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang xa hoi. ((hieu van) or (thien van)) ((cam thuc) OR (am thuc)) va minh hai cau treo*.