Perhaps you should try some spelling variations:
hinh trong » chinh trong, dinh trong, sinh trong
hanh trong » hanh trang, anh trong, chinh trong
hoc chieu » hoc thieu, ho chieu, hoc dieu
quan dung » quang dung, quan duong, qua dung
trong san » trong cac, cong san, dong san
san toan » van toan, dan toan, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) or (hoc hien)) xanh - ((hanh trong) OR (hinh trong)) quan dung trong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc hien)) xanh - ((hanh trong) OR (hinh trong)) quan dung trong san toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (hoc hien)) xanh - ((hanh trong) OR (hinh trong)) quan dung trong san toan ban*".