Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su triet » su viet, ve triet
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su tien » su kien, su hien, tu tieng

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 ty nang xa hoi. ((hieu vien) or (hieu viec)) cac nuoc van hanh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu vien) OR (hieu viec)) cac nuoc van hanh vi ((su triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu vien) or (hieu viec)) cac nuoc van hanh vi ((su triet) or (su tien))*.