Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
dung cong » dung trong
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
ho cuu » ho chu, so cuu, khao cuu
ho cua » hoc cua, hoi cua, hoa cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho cuu) OR (ho cua)) tinh - hanh tinh quang ((nhung cong) or (dung cong)) tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho cuu) OR (ho cua)) tinh - hanh tinh quang ((nhung cong) OR (dung cong)) tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho cuu) OR (ho cua)) tinh - hanh tinh quang ((nhung cong) or (dung cong)) tan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho cuu) OR (ho cua)) tinh - hanh tinh quang ((nhung cong) or (dung cong)) tan toan cao*.