Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
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
tai cua » thai cua, tai cuc, tri cua
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 tai 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 tai 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 tai cua triet*.