Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van danh » van doanh, van hanh, van manh
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
bach ha » bac ha, bich ha, sach ha
van anh » van thanh, tuan anh, van minh
cuu tre » cua tre, cau treo

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 bach ha ((van danh) or (van anh)) vai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu vien bach ha ((van danh) OR (van anh)) vai ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu vien bach ha ((van danh) or (van anh)) vai ((cuu tre) OR (cau tren))*".