Perhaps you should try some spelling variations:
hanh loai » thanh hoai, thanh loan, phan loai
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
duc van » duc tan, duc manh, duc phan
loai va » loai nam
x hoi » xa hoi, o hoi, 5 hoi

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x hoi) OR (x ho)). hieu ve cham ((duc van) OR (duc va)) hanh loai va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) OR (x ho)). hieu ve cham ((duc van) or (duc va)) hanh loai va triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) OR (x ho)). hieu ve cham ((duc van) or (duc va)) hanh loai va triet*.