Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
hang hang » nang hang, cang thang, hung thang
trong van » trong cac
doc hieu » toc thieu, hoc thieu, hoc hien
hanh han » hanh nhan, hanh phan, hanh san
luong va » dung va
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - ((hanh han) or (hang hang)) cua cong ((trong van) or (luong va)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - ((hanh han) OR (hang hang)) cua cong ((trong van) OR (luong va)) toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - ((hanh han) or (hang hang)) cua cong ((trong van) or (luong va)) toan cao*.