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 » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
tap toan » tap doan, tap quan, bai toan
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: ((hoc thieu) or (theo tieu)) sach - hanh trinh cua ((hang cong) OR (bang cong)) tap toan cao~.
• 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 (bang cong)) tap toan cao.
• 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 (bang cong)) tap toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo tieu)) sach - hanh trinh cua ((hang cong) OR (bang cong)) tap toan cao*.