Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, theo sach
bang huong » bang phuong, ban huong, bang suong
hieu cach » hieu cac, chieu sach, hieu ca
ban chua » ban cua, benh chua, nhan chua
ban chia » ban chi, van chia, ban chinh
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) OR (hieu cach)) - hanh ((ban chua) or (ban chia)) bang huong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - hanh ((ban chua) OR (ban chia)) bang huong dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - hanh ((ban chua) or (ban chia)) bang huong dan than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - hanh ((ban chua) or (ban chia)) bang huong dan than cao*.