Perhaps you should try some spelling variations:
thien van » thi van
hai hau » hai chau, dai hau, hai hai
hai cau » hai chau, hai chu, hoi cau
va danh » va dinh, va dan, va hanh
su sach » vu sach
van cau » van dau, van hau, van chat
so sach » so sanh, bo sach, co sach
cau tuc » cau truc, cau tu, cau luc
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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