Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nhan hoi » nhan hoa, nhan hoc, nhan hop
hieu van » hieu va, thien van, lieu va
mai khoi » mai khoa, tai khoa, cac khoi
dai hoi » dai hoc, dai hai, dai moi
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
va nhan » van nhan, ca nhan, va phan
cua tre » cua te, cuu tre, dua tren
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((mai khoi) or (dai hoi)). hieu van cam duc va nhan hoi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((mai khoi) OR (dai hoi)). hieu van cam duc va nhan hoi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((mai khoi) or (dai hoi)). hieu van cam duc va nhan hoi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((mai khoi) or (dai hoi)). hieu van cam duc va nhan hoi ((cua tre) OR (cua triet))*.