Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien danh
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
thien anh » thien danh, tien anh, thien thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh ve » trinh he, trinh va, trinh vi
ve nhung » va nhung, tu nhung
cong tac » cong ty
tac chan » tac chuan, tac can, tac chon
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((thieu xanh) or (thien anh))) or (hieu manh)) - canh trinh ve nhung cong tac chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thieu xanh) OR (thien anh))) OR (hieu manh)) - canh trinh ve nhung cong tac chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((((thieu xanh) or (thien anh))) or (hieu manh)) - canh trinh ve nhung cong tac chan cau*.