Perhaps you should try some spelling variations:
sach nhan » sach nha, sach han, sach ngan
nhan lang » nhanh lang, nhan dang, nhon lang
van hanh » van thanh, ban hanh, van ban
tu sach » thu sach, su sach, te sach
van anh » van thanh, tuan anh, van minh
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 nhan lang xa hoi. ((hieu ve) or (hieu qua)) cau luc ((van hanh) or (van anh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach nhan lang xa hoi. ((hieu ve) OR (hieu qua)) cau luc ((van hanh) OR (van anh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach nhan lang xa hoi. ((hieu ve) or (hieu qua)) cau luc ((van hanh) or (van anh)) vi cua tre*.