Perhaps you should try some spelling variations:
sach hay » sach han, sach ha, sach nay
van hanh » van thanh, ban hanh, van ban
dang xay » dang van, van xay
cau phuc » cau truc, chau phu, huu phuc
su sach » so sach, vu sach
van anh » van thanh, tuan anh, van minh
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
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: su sach hay ((lang xa) or (dang xay)) hoi. hieu ve cau phuc ((van hanh) OR (van anh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hay ((lang xa) OR (dang xay)) hoi. hieu ve cau phuc ((van hanh) OR (van anh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hay ((lang xa) or (dang xay)) hoi. hieu ve cau phuc ((van hanh) OR (van anh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach hay ((lang xa) or (dang xay)) hoi. hieu ve cau phuc ((van hanh) OR (van anh)) vi cua tre*.