Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
chong cong » cong cong, thong cong, cuong cong
hoc thieu » toc thieu, hoc hien
cua chong » cua cong, cua chung, cua khong
trinh san » trinh han, trinh quan, trinh toan
san lap » sang lap, dan lap, sai lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo tieu) or (hoc thieu)) sach - ((hanh tranh) OR (hanh trang)) cua chong cong trinh san lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (hoc thieu)) sach - ((hanh tranh) OR (hanh trang)) cua chong cong trinh san lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tieu) or (hoc thieu)) sach - ((hanh tranh) OR (hanh trang)) cua chong cong trinh san lap".
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (hoc thieu)) sach - ((hanh tranh) OR (hanh trang)) cua chong cong trinh san lap*.