Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
va triet » va thiet, va trien, ve triet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cua tre » cua te, cuu tre, cua triet
danh ca » dan ca, doanh cua, danh cho
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac luc » cau luc, coc luc, cac cuoc
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu vien ((cac luc) OR (cac nuoc)) va danh ca ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu vien ((cac luc) OR (cac nuoc)) va danh ca ((cua tre) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu vien ((cac luc) OR (cac nuoc)) va danh ca ((cua tre) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu vien ((cac luc) OR (cac nuoc)) va danh ca ((cua tre) or (va triet))*.