Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang vai » hang tai, hang hai, hang vi
cham duc » pham duc, cham soc, pham duy
nang cai » nang cao, nang tai, nang cap
ve cham » va cham, ve chat, vu cham
su sach » so sach
cai hoi » cau hoi, dai hoi, cai hoa
vu sach » vu bach, vu khach
hieu ve » hieu va, hieu van

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 (vu sach)) ky nang cai hoi. hieu ve cham duc va ((hang vai) or (hang va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang cai hoi. hieu ve cham duc va ((hang vai) OR (hang va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang cai hoi. hieu ve cham duc va ((hang vai) or (hang va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang cai hoi. hieu ve cham duc va ((hang vai) or (hang va)) cua triet*.