Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van dam
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
xuc va » duc va, tuc va, luc va
vi cu » vi su, vi xu, vi 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 y ((nang xa) or (lang xa)) hoi. hieu ((van cam) or (van cau)) xuc va hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (lang xa)) hoi. hieu ((van cam) OR (van cau)) xuc va hanh vi cu tren.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (lang xa)) hoi. hieu ((van cam) or (van cau)) xuc va hanh vi cu tren*.