Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
van thanh » ban thanh, van tuan
da trong » dat trong, dao trong, dai trong
cong van » cong vang, cong san, song van
thanh ca » thanh cha, thanh cac, thanh ha
hieu va » lieu va, hieu qua
cong da » cong dan, cong dac, cong dau

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) or (hieu va)) - thanh cong da trong cong van thanh ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sach) OR (hieu va)) - thanh cong da trong cong van thanh ca.
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) or (hieu va)) - thanh cong da trong cong van thanh ca*.