Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
cam truc » cau truc, nam truc, lam truoc
hieu ve » hieu van
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. ((hieu ve) or (hieu va)) cam truc van hanh di ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu ve) OR (hieu va)) cam truc van hanh di ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu ve) or (hieu va)) cam truc van hanh di ((cua tre) or (su triet))*.