Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hanh sinh » hanh tinh, hanh dinh, hinh sinh
dung cong » dung trong
trinh qua » trinh quan, trinh cua, trinh quang
hoi hieu » hoi phieu, hoi tieu, doi chieu
moi hieu » moi dieu, doi chieu, mot chieu
sinh cua » manh cua, dinh cuu, sinh va
qua dau » qua da, qua bau, qua dan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoi hieu) OR (moi hieu)) lang - hanh sinh cua ((nhung cong) OR (dung cong)) trinh qua dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoi hieu) or (moi hieu)) lang - hanh sinh cua ((nhung cong) OR (dung cong)) trinh qua dau~".
• Adding a wildcard symbol may retrieve word variants: ((hoi hieu) or (moi hieu)) lang - hanh sinh cua ((nhung cong) OR (dung cong)) trinh qua dau*.