Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
hoc thieu » toc thieu, hoc hien
dong cong » duong cong, dang cong, cong cong
dung cong » dung trong
theo chu » theo chieu, cho chu, chao chu
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chu) or (hoc thieu)) manh - hanh trinh quan ((dong cong) OR (dung cong)) tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chu) OR (hoc thieu)) manh - hanh trinh quan ((dong cong) OR (dung cong)) tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chu) or (hoc thieu)) manh - hanh trinh quan ((dong cong) OR (dung cong)) tan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chu) or (hoc thieu)) manh - hanh trinh quan ((dong cong) OR (dung cong)) tan toan cau*.