Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc thiet » hoc thieu, hoc hien, toc thieu
tranh cua » doanh cua, manh cua
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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) OR (hoc thuyet)) danh - canh tranh cua ((nhung cong) or (thong cong)) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thuyet)) danh - canh tranh cua ((nhung cong) OR (thong cong)) dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc thuyet)) danh - canh tranh cua ((nhung cong) or (thong cong)) dan than cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc thuyet)) danh - canh tranh cua ((nhung cong) or (thong cong)) dan than cao*.