Perhaps you should try some spelling variations:
nhanh lang » nhanh quang, nhanh thang, nhan dang
dung trung » dung trong, quang trung, dung ung
trung thpt » truong thpt, trung thuc, trung nhat
thac doc » than doc, thac toc, thach duc
doc sach » hoc sach, toc sach, nuoc sach
nhan dan » phan dau, gian dan, nhan tai
van dung » van dong, xay dung, tin dung
thpt van » thpt dan, thpt tran, hat van
van chat » cao chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: thac doc sach - ((nhanh lang) or (nhan dan)) van dung trung thpt van chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thac doc sach - ((nhanh lang) OR (nhan dan)) van dung trung thpt van chat.
• Adding a wildcard symbol may retrieve word variants: thac doc sach - ((nhanh lang) or (nhan dan)) van dung trung thpt van chat*.