Perhaps you should try some spelling variations:
phan dang » phan dau, phan cong, phan ung
dung cong » dung trong
cong thpt » cong thuc, cong thai, cong nhat
toc sach » hoc sach, doc sach, thuoc 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
ho toc » hoa toc, co toc, so toc

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

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