Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
thiet hach » thien hach, thuyet hach, thiet hai
thanh tran » thanh trang, thanh toan, thanh tra
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh dang » hanh dong, anh dang, hanh dung
dong cong » duong cong, dung cong, dang cong
dang van » hoang van, hang va
tran ban » tranh ban, tran van, toan ban

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 hach - hanh dang van dong cong thanh tran ban~.
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - hanh dang van dong cong thanh tran ban*.