Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thanh dung » thanh duong, thanh tung, thanh hung
hang luong » nang luong, hang thuong, hoang vuong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
doan phan » doanh phan, toan phan, doanh nhan
dung van » duong van, dung va, dang van
van hang » van khang, van hoang, van thang
dan phan » dan chan, van phan, dam phan

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 tach - thanh dung van hang luong ((dan phan) or (doan phan)) lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh dung van hang luong ((dan phan) OR (doan phan)) lap*.