Perhaps you should try some spelling variations:
ban thanh » ban hang
vien cac » vien bach, vien dai, gian cac
ban hanh » ban hang
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
vien da » vien dai, hien dai
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky lang xa hoi. hieu ((vien cac) or (vien da)) xuc ((ban thanh) OR (ban hanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky lang xa hoi. hieu ((vien cac) OR (vien da)) xuc ((ban thanh) OR (ban hanh)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky lang xa hoi. hieu ((vien cac) or (vien da)) xuc ((ban thanh) OR (ban hanh)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su cac ky lang xa hoi. hieu ((vien cac) or (vien da)) xuc ((ban thanh) OR (ban hanh)) vai cuu tre*.