Perhaps you should try some spelling variations:
chiet tach » chieu sach
thanh tung » thanh cong
dung cong » dung trong
ho chiet » ho chieu, ho thiet, hoc thiet
qua dung » quang dung, su dung, qua song
cong tan » cong tac, cong san, cong thanh
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - ((thanh trung) or (thanh tung)) qua dung cong tan ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - ((thanh trung) OR (thanh tung)) qua dung cong tan ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - ((thanh trung) or (thanh tung)) qua dung cong tan ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - ((thanh trung) or (thanh tung)) qua dung cong tan ((toan cao) OR (toan tap))*.