Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
thien van » thi van
danh hai » dang hai, lanh hai, manh hai
hai cau » hai chau, hai chu, hai hau
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
so sanh » do sanh
van cau » van dau, van hau, van chat
tuc va » truc va, tuc xa, duc va
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 sanh)) y nang x hoi. thien van cau ((tuc va) OR (thuc va)) danh hai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) y nang x hoi. thien van cau ((tuc va) OR (thuc va)) danh hai cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) y nang x hoi. thien van cau ((tuc va) OR (thuc va)) danh hai cau triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) y nang x hoi. thien van cau ((tuc va) OR (thuc va)) danh hai cau triet*.