Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, thien dang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tinh quan » tinh quang, trinh quan, tin quan
dung cong » dung trong
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
lien » bien, vien, tien

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 ((tinh quan) or (lien quan)) dung cong ((dan toan) OR (van toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - hanh ((tinh quan) OR (lien quan)) dung cong ((dan toan) OR (van toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet danh - hanh ((tinh quan) or (lien quan)) dung cong ((dan toan) OR (van toan)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - hanh ((tinh quan) or (lien quan)) dung cong ((dan toan) OR (van toan)) tap*.