Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
thuat cam » thuat dam, thuat chan, thuat xay
cong dac » cong tac, cong dan, cong cac
dac dung » dan dung, tac dung, duc dung
chat ran » chat ban, chat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sach - thanh cong dac dung cong vang ((chat ran) or (thuat cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - thanh cong dac dung cong vang ((chat ran) OR (thuat cam)).
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - thanh cong dac dung cong vang ((chat ran) or (thuat cam))*.