Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuoc sai » thuoc tai, thuoc san, thuoc phai
minh via » minh va, minh vua, minh giao
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
via cua » gia cua, gian cua, giau cua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
lo van » vo van, so van, do van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (thuoc sai)) ky nang xa hoi. hieu ve cac ((lo van) OR (le van)) minh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuoc sai)) ky nang xa hoi. hieu ve cac ((lo van) OR (le van)) minh via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (thuoc sai)) ky nang xa hoi. hieu ve cac ((lo van) OR (le van)) minh via cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuoc sai)) ky nang xa hoi. hieu ve cac ((lo van) OR (le van)) minh via cua tre*.