Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
chu manh » ho manh, chu han, chu van
trang va » hang va
tran van » luan van
cong van » cong vang, cong san, song van
van quan » van ban
quan lan » quan luan, quan lang, quan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chu manh) or (chieu sach)) - hanh ((trang va) OR (tran van)) nhung cong van quan lan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu manh) OR (chieu sach)) - hanh ((trang va) OR (tran van)) nhung cong van quan lan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu manh) or (chieu sach)) - hanh ((trang va) OR (tran van)) nhung cong van quan lan".
• Adding a wildcard symbol may retrieve word variants: theo ((chu manh) or (chieu sach)) - hanh ((trang va) OR (tran van)) nhung cong van quan lan*.