Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cham duc » pham duc, cham soc, pham duy
ve cham » va cham, ve chat, vu cham
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ((x hoi) OR (o hoi)). hieu ve cham duc ((van hanh) or (ban hanh)) dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((x hoi) OR (o hoi)). hieu ve cham duc ((van hanh) OR (ban hanh)) dai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((x hoi) OR (o hoi)). hieu ve cham duc ((van hanh) or (ban hanh)) dai cua triet*".