Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hieu van » hieu va, thien van, hieu ve
thai cua » than cua, tai cuc, tri cua
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac 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) or (lieu va)) bac ((xuc va) OR (duc va)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. ((hieu van) OR (lieu va)) bac ((xuc va) OR (duc va)) hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. ((hieu van) or (lieu va)) bac ((xuc va) OR (duc va)) hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. ((hieu van) or (lieu va)) bac ((xuc va) OR (duc va)) hanh thai cua tre*.