Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
hanh tri » thanh tri, hanh tai, hanh trinh
tu sach » thu sach, su sach, te sach
song xa » song cua
hieu ve » hieu va, hieu van
vuc van » duc van, luc van, chuc van
cua tre » cua te, cuu tre, cua triet
y song » _ song, c song, k song

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 y song xa hoi. ((hieu ve) or (hieu qua)) cam ((vuc van) OR (thuc van)) hanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y song xa hoi. ((hieu ve) OR (hieu qua)) cam ((vuc van) OR (thuc van)) hanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y song xa hoi. ((hieu ve) or (hieu qua)) cam ((vuc van) OR (thuc van)) hanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y song xa hoi. ((hieu ve) or (hieu qua)) cam ((vuc van) OR (thuc van)) hanh tri cua tre*.