Perhaps you should try some spelling variations:
trong thpt » truong thpt, trong thuat, trong thiet
phan dang » phan dau, phan cong, nhan dan
thac toc » cac toc, thac cac, thi toc
toc sach » hoc sach, doc sach, thuoc sach
gian dan » gian lang
van dung » van dong, xay dung, tin dung
thpt dan » thuc dan, tho dan
dan chat » van chat, dan chan, ban 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 toc sach - ((phan dang) or (gian dan)) van dung trong thpt dan chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thac toc sach - ((phan dang) OR (gian dan)) van dung trong thpt dan chat.
• Adding a wildcard symbol may retrieve word variants: thac toc sach - ((phan dang) or (gian dan)) van dung trong thpt dan chat*.