Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh trang » thanh trung, canh tranh, hanh trinh
hanh tang » anh tang, hanh mang, hanh tung
cua thong » cua thuong, cua khong, cua tong
cong tac » cong ty
tac tren » rac tren, tai tren, tap tren
tren cao » tren co, tren ca, tren cay
doi thi » doi thoi, do thi, doi thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi thi) or (doi khi)) canh - ((hanh tang) or (hanh trang)) cua thong cong tac tren cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi thi) OR (doi khi)) canh - ((hanh tang) OR (hanh trang)) cua thong cong tac tren cao.
• Adding a wildcard symbol may retrieve word variants: ((doi thi) or (doi khi)) canh - ((hanh tang) or (hanh trang)) cua thong cong tac tren cao*.