Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
van bac » van ban, van hac, dan bac
van bao » van ban, van dao
han tai » hang tai, nhan tai, van tai
cuc tre » duc tre, cua tre, cuu tre
xuc va » duc va, tuc va, luc va
va han » va phan, van han, va hanh

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 ky ((nang xa) OR (lang xa)) hoi. hieu ((van bac) or (van bao)) xuc va han tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang xa) OR (lang xa)) hoi. hieu ((van bac) OR (van bao)) xuc va han tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang xa) OR (lang xa)) hoi. hieu ((van bac) or (van bao)) xuc va han tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang xa) OR (lang xa)) hoi. hieu ((van bac) or (van bao)) xuc va han tai cuc tre*.