Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
phan xuong » phan cong
xuong cong » luong cong, duong cong, cuong cong
thanh phan » thanh pho, thanh san, thanh toan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
manh hung » anh huong
hung phan » huong phan, nhung phan, dung phan
toan phan » toan ban, hoa phan, luan 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 - manh hung phan xuong cong ((toan phan) or (thanh phan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - manh hung phan xuong cong ((toan phan) OR (thanh phan)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - manh hung phan xuong cong ((toan phan) or (thanh phan)) tap*.