Perhaps you should try some spelling variations:
chiet tach » chieu sach
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
lieu tinh » trieu tinh, diep tinh, bien tinh
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
tac chan » tac chuan, tac chon, tac nhan
tac can » tac van, tac quan, tac vang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((lieu tinh) or (chiet tach)) - canh trinh vat nhung cong ((tac chan) OR (tac can)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((lieu tinh) OR (chiet tach)) - canh trinh vat nhung cong ((tac chan) OR (tac can)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((lieu tinh) or (chiet tach)) - canh trinh vat nhung cong ((tac chan) OR (tac can)) tu".
• Adding a wildcard symbol may retrieve word variants: ho ((lieu tinh) or (chiet tach)) - canh trinh vat nhung cong ((tac chan) OR (tac can)) tu*.