Perhaps you should try some spelling variations:
su triet » su tien, ve triet
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
su viet » so viet
hieu ve » hieu va, hieu van
ty nang » ky nang, ty hang, ly nang
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) o hoi. hieu ve cac tuc va hanh vi ((su triet) OR (su viet))~.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) o hoi. hieu ve cac tuc va hanh vi ((su triet) or (su viet))*.