Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hoa thiet » hoc thiet, toan thiet, hoa viet
nang hang » nang sang, hang hang, cang thang
ho thiet » hoc thiet, so thiet, hoc thieu
va thong » va thuong, va phuong, he thong
tan van » tran van, tang van, dang van
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho thiet) or (hoa thiet)) tach - nang hang va thong cong ((tan van) OR (luan van)) hau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thiet) OR (hoa thiet)) tach - nang hang va thong cong ((tan van) OR (luan van)) hau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) or (hoa thiet)) tach - nang hang va thong cong ((tan van) OR (luan van)) hau".
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) or (hoa thiet)) tach - nang hang va thong cong ((tan van) OR (luan van)) hau*.