Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thien van » thi van
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
su sach » so sach, vu sach
ma hoi » xa hoi, ma hoa, me hoi
luc va » duc va, tuc va
loc va » hoc va
vi cua » vai cua, di cua

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 ty nang ((ma hoi) or (mai hoi)). thien van cau ((luc va) OR (loc va)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ma hoi) OR (mai hoi)). thien van cau ((luc va) OR (loc va)) hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((ma hoi) or (mai hoi)). thien van cau ((luc va) OR (loc va)) hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((ma hoi) or (mai hoi)). thien van cau ((luc va) OR (loc va)) hanh vi cua triet*.