Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
nam duc » nam duoc, pham duc, nam thuc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
su sai » su tai, su hai, su dai
sai ky » sac ky
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 sai ky nang ((x hoi) or (xa hoi)). hieu van nam duc va hanh vi ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ((x hoi) OR (xa hoi)). hieu van nam duc va hanh vi ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sai ky nang ((x hoi) or (xa hoi)). hieu van nam duc va hanh vi ((cuu tre) or (cua triet))*.