Perhaps you should try some spelling variations:
trong thpt » truong thpt, trong thuat, trong thiet
phan dat » phan dau, phan dai, phan day
dat dung » dan dung, vat dung, da dung
thpt dan » thuc dan, tho dan
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chi) or (toc thieu)) sach - phan dat dung trong thpt dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chi) OR (toc thieu)) sach - phan dat dung trong thpt dan khan cap.
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (toc thieu)) sach - phan dat dung trong thpt dan khan cap*.