Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
danh thanh » dinh thanh, dang thanh, nhanh thanh
hoc thiet » hoc thieu, hoc thuyet, toc thieu
tuong vao » tuong va, tuong vo, tuong dao
cong danh » cuong danh, cong dan, cong thanh
thanh lap » thanh san, phan lap, thanh hai
tung vap » tung va, trung van, dung va

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 hien)) tach - thanh ((tung vap) or (tuong vao)) nhung cong danh thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc hien)) tach - thanh ((tung vap) OR (tuong vao)) nhung cong danh thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc hien)) tach - thanh ((tung vap) or (tuong vao)) nhung cong danh thanh lap".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc hien)) tach - thanh ((tung vap) or (tuong vao)) nhung cong danh thanh lap*.