Perhaps you should try some spelling variations:
ban hang » ngan hang
dinh chi » dinh thi, dinh tri, dinh moi
vu sach » vu bach, vu khach
su sach » so sach
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va thanh, va danh
chi tre » choi tre, cho tre, chi tro

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

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