Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua viet » ca viet, hoa viet, cua vat
hanh dao » lanh dao, thanh dat, thanh dam
vien cac » vien bach, vien dai, vien da
nang xa » nang x, lang xa, nang ma
te sach » toc sach
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
tu sach » thu sach, su sach, tu cach
tuc va » thuc va, truc va, tuc xa

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) or (te sach)) ky nang xa hoi. hieu vien cac tuc va hanh dao ((cuu tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang xa hoi. hieu vien cac tuc va hanh dao ((cuu tre) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang xa hoi. hieu vien cac tuc va hanh dao ((cuu tre) or (cua viet))*.