Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chieu » hoc thieu, ho chieu, hoc dieu
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan tap » toan tap, han tap, tan tat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) or (hoc hien)) sach - hanh tranh ((cua tong) OR (cua dong)) cong van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc hien)) sach - hanh tranh ((cua tong) OR (cua dong)) cong van tan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (hoc hien)) sach - hanh tranh ((cua tong) OR (cua dong)) cong van tan tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc hien)) sach - hanh tranh ((cua tong) OR (cua dong)) cong van tan tap*.