Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cac » vien cac, dien cac, bien cac
su triet » su tien, ve triet
van anh » van thanh, tuan anh, van minh
toc van » hoc van, toc san, tac van
cac toc » cac toi, cac nuoc, cac thoi
so sach » bo sach, co sach, hoc sach
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
so sanh » do sanh
su viet » so viet
anh vi » hanh vi, anh va, anh ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (so sanh)) tu nang xa hoi. thieu nien cac toc van anh vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) tu nang xa hoi. thieu nien cac toc van anh vi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) tu nang xa hoi. thieu nien cac toc van anh vi ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) tu nang xa hoi. thieu nien cac toc van anh vi ((su triet) or (su viet))*.