Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, hinh tai
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van hac » van hoc, van ha, van hai
han tai » hang tai, nhan tai, van tai
cuc tre » duc tre, cua tre, cuu tre
xuc va » duc va, tuc va, luc va

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