Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
ban hanh » ban hang
tham duc » pham duc, than duc, thach duc
sach ty » sach y, sach tu, sach thu
tham du » thap du, tham do, pham duc
ty nang » ky nang, ty xang, ty hang
lai cua » dai cua, hai cua, lai chau
su sach » so sach, vu sach
x hoi » o 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 (xa hoi)). hieu van ((tham duc) or (tham du)) ban hanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((x hoi) OR (xa hoi)). hieu van ((tham duc) OR (tham du)) ban hanh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((x hoi) OR (xa hoi)). hieu van ((tham duc) or (tham du)) ban hanh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((x hoi) OR (xa hoi)). hieu van ((tham duc) or (tham du)) ban hanh lai cua triet*.