Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh nhung » anh nhung, canh nhung, doanh nhung
nhung cao » nhung cau, nung cao, nhung ca
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien hach) or (chinh sach)) - hanh nhung cao ((dong cong) OR (dang cong)) dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (chinh sach)) - hanh nhung cao ((dong cong) OR (dang cong)) dan phan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (chinh sach)) - hanh nhung cao ((dong cong) OR (dang cong)) dan phan cau*".