Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
tinh dai » trinh dai, tinh da, tinh hai
dam thuc » am thuc, dan thuc, nam thuc
nang lai » nang tai, mang lai, nang cai
lai hoi » dai hoi, lai hoa, lai roi
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
va tinh » may tinh
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
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 ty nang lai hoi. hieu ve ((dam thuc) or (cam tu)) va tinh dai ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang lai hoi. hieu ve ((dam thuc) OR (cam tu)) va tinh dai ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang lai hoi. hieu ve ((dam thuc) or (cam tu)) va tinh dai ((cua triet) or (su triet))*.