Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, hieu ve
cham duc » pham duc, cham soc, pham duy
tan hanh » tan thanh, tang hanh, toan hanh
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
lai cua » dai cua, hai cua, lai chau
x hoi » xa hoi, o hoi, x ho

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