Perhaps you should try some spelling variations:
vien cac » vien dai, vien da, gian cac
dao danh » dao doanh, do danh, dao dan
danh vai » danh sai, danh va, doanh van
cau treo » cau theo, cau tren, cau triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

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