Perhaps you should try some spelling variations:
thanh thanh » nhanh thanh, thanh toan, thanh phan
nhung cong » dung cong, thong cong, hang cong
cong thanh » dong thanh, cong trinh, cong tan
hoc thiet » hoc thieu, hoc thuyet, toc thieu
tuong dao » truong dao, duong dao, luong dao
thanh lap » thanh san, phan lap, thanh hai
tung va » trung va, tuong va, 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 va) or (tuong dao)) nhung cong thanh thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc hien)) tach - thanh ((tung va) OR (tuong dao)) nhung cong thanh thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc hien)) tach - thanh ((tung va) or (tuong dao)) nhung cong thanh thanh lap".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc hien)) tach - thanh ((tung va) or (tuong dao)) nhung cong thanh thanh lap*.