Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
nhan dang » nhan dan, phan dang, tran dang
x truong » xa truong, _ truong, o truong
thpt dan » thuc dan, tho dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
dang x » dang y, nang x, dang _

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (toc thieu)) sach - nhan dang x truong thpt dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sach - nhan dang x truong thpt dan than cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sach - nhan dang x truong thpt dan than cau*.