Perhaps you should try some spelling variations:
thanh trien » thanh tien, thanh truyen, thanh vien
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trien viet » tieng viet
viet dung » viet hung, viet huong, viet trung
dang van » hoang van, hang va
dan van » doan van, tan van, san van
dao van » do van

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 - thanh trien viet dung trong ((((dan van) or (dao van))) or (dang van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh trien viet dung trong ((((dan van) OR (dao van))) OR (dang van)) ban.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh trien viet dung trong ((((dan van) or (dao van))) or (dang van)) ban*.