Perhaps you should try some spelling variations:
thien van » thi van
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, lieu va, hieu ve
vu sach » vu bach, su sach
nang xa » nang x, lang xa, nang ma
cau luc » cau truc, cau phuc
va tich » va tinh, va dich
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

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 (vu khach)) ky nang xa hoi. ((hieu van) OR (thien van)) cau luc va tich va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang xa hoi. ((hieu van) OR (thien van)) cau luc va tich va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ky nang xa hoi. ((hieu van) OR (thien van)) cau luc va tich va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ky nang xa hoi. ((hieu van) OR (thien van)) cau luc va tich va cua tre*.