Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cua nhung » va nhung
cong vang » cong lang, cong quang, cong ngang
vang phan » van phan, nang phan, quang phan
ho chiet » ho chieu, ho thiet, hoa thiet
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chiet) OR (hoc thiet)) tach - ((thanh tung) or (thanh cong)) cua nhung cong vang phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chiet) OR (hoc thiet)) tach - ((thanh tung) OR (thanh cong)) cua nhung cong vang phan dau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chiet) OR (hoc thiet)) tach - ((thanh tung) or (thanh cong)) cua nhung cong vang phan dau*".