Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
danh hai » dang hai, lanh hai, manh hai
hieu van » thien van, lieu va, hieu ve
ly nang » ky nang, ly hang, ly vang
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
lam tuc » lam thuoc, lam truoc, luat tuc
va danh » va dinh, va dan, va hanh
hai cau » hai chau, hai chu, hai hau
su sach » vu sach
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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