Perhaps you should try some spelling variations:
thien van » thi van
hanh vai » hanh vi, hanh va, hanh tai
va triet » va thiet, va trien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
sach ly » sach y, sach lo, sach ty
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
ly nang » ky nang, ly hang, ly vang
su sach » so sach, vu sach
ma hoi » xa hoi, ma hoa, me hoi
vai va » mai va, dai va, hai va

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