Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
thien van » thi van
manh hai » lanh hai, minh hai, thanh hai
danh hai » dang hai, lanh hai, danh hau
su sach » vu sach
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
so sach » so sanh, bo sach, co sach
van cau » van dau, van hau, van chat
cau tu » dau tu, cau truc

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