Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc thien » hoc hien, hoc thieu, hoc thiet
hanh hang » thanh hang, hang hang, hanh han
thanh lap » thanh san, phan lap, thanh hai
than cau » toan cau, phan cau, than cap

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 - hanh hang va ((nhung cong) or (thong cong)) dan ((than cau) or (thanh lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh hang va ((nhung cong) OR (thong cong)) dan ((than cau) OR (thanh lap)).
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh hang va ((nhung cong) or (thong cong)) dan ((than cau) or (thanh lap))*.