Perhaps you should try some spelling variations:
thien van » thi van
so sach » so sanh, bo sach, co sach
sach lo » sach dao, sach doi, sach hoi
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
ca tren » cau tren, cu tren, la tren
cac tuc » cac toc, cac tac, cac nuoc
nang xa » nang x, lang xa, nang ma
lo nang » ho nang, ly nang, loai nang
cac tu » cac thu, cach tu, cac du

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 lo nang xa hoi. thien van ((cac tuc) OR (cac tu)) va hanh vi ((cua tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach lo nang xa hoi. thien van ((cac tuc) OR (cac tu)) va hanh vi ((cua tre) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach lo nang xa hoi. thien van ((cac tuc) OR (cac tu)) va hanh vi ((cua tre) or (ca tren))".
• Adding a wildcard symbol may retrieve word variants: so sach lo nang xa hoi. thien van ((cac tuc) OR (cac tu)) va hanh vi ((cua tre) or (ca tren))*.