Perhaps you should try some spelling variations:
dinh dai » dinh dat, sinh dai, dinh dao
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
loc va » hoc va
luc va » duc va, tuc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang xa hoi. ((hieu ve) or (lieu va)) cau ((loc va) OR (luc va)) dinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu ve) OR (lieu va)) cau ((loc va) OR (luc va)) dinh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((hieu ve) or (lieu va)) cau ((loc va) OR (luc va)) dinh dai cua tre*".