Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh tranh » hanh trinh, hanh trang, lanh tranh
cong duong » cuong duong, cong dong, con duong
duong van » duong va, luong va, dang van
van tan » van tuan, van ban, van tai
tan ban » toan ban, tang ban, van ban

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 (nhieu tang)) - ((hanh tranh) OR (canh tranh)) cua cong duong van tan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (nhieu tang)) - ((hanh tranh) OR (canh tranh)) cua cong duong van tan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (nhieu tang)) - ((hanh tranh) OR (canh tranh)) cua cong duong van tan ban".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (nhieu tang)) - ((hanh tranh) OR (canh tranh)) cua cong duong van tan ban*.