Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh binh » thanh binh, nhanh binh, manh binh
hung cong » nhung cong, hung cuong, phung cong
binh lan » binh luan, binh dan, binh tan
lan hung » van hung, luan chung, lan phuong
tac toan » tap toan, tam toan, hach toan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) OR (chieu sang)) - hanh binh lan hung cong ((tac toan) or (bai toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chieu sang)) - hanh binh lan hung cong ((tac toan) OR (bai toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chieu sang)) - hanh binh lan hung cong ((tac toan) or (bai toan)) cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chieu sang)) - hanh binh lan hung cong ((tac toan) or (bai toan)) cao*.