Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
te sach » toc sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
dao voi » da voi, dao noi, do voi
voi cuu » voi cuoc
cuu tre » cua tre, cau tren, cau treo
cac tu » cac thu, cach tu, cac du
va dao » ca dao
x hoi » xa hoi, o hoi, x ho

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) OR (te sach)) ky nang x hoi. ((hieu ve) or (hieu va)) cac tu va dao voi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x hoi. ((hieu ve) OR (hieu va)) cac tu va dao voi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang x hoi. ((hieu ve) or (hieu va)) cac tu va dao voi cuu tre*".