Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
hieu hien » bieu hien, dieu hien, chieu chien
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
hoc vat » hoc va, hoc viet, thuc vat
cac hoc » cach hoc, cac hop, bac hoc
su tien » su kien, su hien, tu tieng
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
vi su » va su, ve su, ki su

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 ky nang xa hoi. ((hieu hien) or (((nhieu viec) or (hieu ve)))) cac hoc vat hanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu hien) OR (((nhieu viec) OR (hieu ve)))) cac hoc vat hanh vi su tien.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu hien) or (((nhieu viec) or (hieu ve)))) cac hoc vat hanh vi su tien*.