Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
ho chieu » theo chieu, hoc thieu, doi chieu
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
doi chi » doi khi

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

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