Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nhanh lang » nhanh quang, nhanh thang, nhan dang
trong thpt » truong thpt, trong thuat, trong thiet
nhan dan » phan dau, gian dan, nhan tai
van dung » van dong, xay dung, tin dung
thpt ban » thpt dan, thuat ban, thpt tran
ban can » ban dan, ban hang, ban hanh

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