Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhanh mang » nhanh lang, nhanh quang, nhanh thang
lieu tinh » trieu tinh, diep tinh, bien tinh
hanh mang » hanh trang, nhanh lang, thanh hang
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cap » khan cap, thanh lap, thanh cac

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 (lieu tinh)) - ((hanh mang) OR (nhanh mang)) cua dung cong tan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (lieu tinh)) - ((hanh mang) OR (nhanh mang)) cua dung cong tan than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (lieu tinh)) - ((hanh mang) OR (nhanh mang)) cua dung cong tan than cap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (lieu tinh)) - ((hanh mang) OR (nhanh mang)) cua dung cong tan than cap*.