Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
luan nhung » luan chung, luan hung, quan nhung
nhung cong » dung cong, thong cong, hang cong
lieu tinh » trieu tinh, diep tinh, bien tinh
hanh tang » hanh trang, hanh mang, hanh tung
anh tang » anh bang, anh dang, anh nang
toan tap » toan ban
cong va » dong va, cong ha, cong tac
va toan » van toan, bai toan, tap toan

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 tang) OR (anh tang)) luan nhung cong va toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (lieu tinh)) - ((hanh tang) OR (anh tang)) luan nhung cong va toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (lieu tinh)) - ((hanh tang) OR (anh tang)) luan nhung cong va toan tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (lieu tinh)) - ((hanh tang) OR (anh tang)) luan nhung cong va toan tap*.