Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
toc van » toc san, tac van, oc van
hoc van » hoc dan, hoc va, hoc vat
viet su » viet suu, viet sau, viet tu
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 ky nang xa hoi. hieu vien cac ((toc van) or (hoc van)) anh viet su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu vien cac ((toc van) OR (hoc van)) anh viet su tien.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu vien cac ((toc van) or (hoc van)) anh viet su tien*.