Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh viec » tinh viet, dinh viec, sinh viec
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, mai doi
lai hoi » dai hoi, lai hoa, lai roi
nam duc » nam duoc, pham duc, nam thuc
va tinh » may tinh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((mai hoi) or (lai hoi)). hieu van nam duc va tinh viec cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai hoi) OR (lai hoi)). hieu van nam duc va tinh viec cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) or (lai hoi)). hieu van nam duc va tinh viec cua triet*.