Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, thien dang
hanh trong » hanh trang, anh trong, hinh trong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thuc dang » thuoc dang, thuc dung, thu dang
thuc dan » thuc hanh, hoc dan, thuc vat
cong san » cong tac
hang tap » hang tai, han tap, hang tmcp

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet danh - hanh trong ((thuc dang) or (thuc dan)) ((cong dong) or (cong san)) hang tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - hanh trong ((thuc dang) OR (thuc dan)) ((cong dong) OR (cong san)) hang tap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - hanh trong ((thuc dang) or (thuc dan)) ((cong dong) or (cong san)) hang tap*.