Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nang cai » nang cao, nang tai, nang cap
tinh dai » trinh dai, tinh da, tinh hai
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
cam tuc » cam xuc, nam thuc, dam thuc
hieu ve » hieu va, hieu van
cai hoi » cau hoi, dai hoi, cai hoa
y nang » ky nang, ly nang, v nang
cam tu » cam thu, nam tu, dam tu

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 y nang cai hoi. hieu ve ((cam tuc) or (cam tu)) va tinh dai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang cai hoi. hieu ve ((cam tuc) OR (cam tu)) va tinh dai ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang cai hoi. hieu ve ((cam tuc) or (cam tu)) va tinh dai ((cua tre) or (su triet))*.