Perhaps you should try some spelling variations:
nang thong » nang thuong, mang thong, nang trong
cdien sach » chieu sach, kien sach
dien sach » dien anh
nhan lang » nhanh lang, nhan dang, nhon lang
thong van » trong van, thong va, thong quan
lang van » dang van, tang van, hoang van
van nang » van quang, van ban, van dong
van tan » van tuan, van ban, van tai
tan tap » toan tap, han tap, tan tat

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((dien sach) or (cdien sach)) - nhan lang van nang thong van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dien sach) OR (cdien sach)) - nhan lang van nang thong van tan tap*.