Perhaps you should try some spelling variations:
van khang » van khanh, van thanh, van quang
khang di » hang di, khang vi, khang voi
te sach » toc sach
hieu va » lieu va, hieu qua
thu van » thuc van, thuy van, tu van
cam thu » nam thu, cac thu, ca thu
cu tren » tu tren, dua tren
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
di cu » di cau, di cua, di du

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) or (so sanh)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cam thu van khang di cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sanh)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cam thu van khang di cu tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (so sanh)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cam thu van khang di cu tren*".