Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thiet danh » thien danh, thien anh, thien dang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh cua » doanh cua, manh cua
dung cong » dung trong
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 - canh tranh cua ((dung cong) or (thong cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - canh tranh cua ((dung cong) OR (thong cong)) dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - canh tranh cua ((dung cong) or (thong cong)) dan toan cao*.