Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hanh hoi » hanh thoi, hanh noi, hanh hoa
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
hoi cua » hoi chuc
tuc van » thuc van, truc van, tuc va
cau tuc » cau truc, cau tu, cau luc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
tu sach » su sach, te sach, tu cach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) cau tuc van hanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cau tuc van hanh hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) cau tuc van hanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) cau tuc van hanh hoi cua tre*.