Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
tap toan » tap doan, tap quan, bai toan
toan tap » toan ban

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) or (theo tieu)) sach - hanh trinh cua ((hang cong) OR (dang cong)) tap toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (theo tieu)) sach - hanh trinh cua ((hang cong) OR (dang cong)) tap toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (theo tieu)) sach - hanh trinh cua ((hang cong) OR (dang cong)) tap toan tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo tieu)) sach - hanh trinh cua ((hang cong) OR (dang cong)) tap toan tap*.