Perhaps you should try some spelling variations:
thien danh » thien dang, thien thanh, thien chanh
hanh trang » thanh trung, canh tranh, hanh trinh
luan phong » luan phuong, xuan phuong, van phong
phong cong » phong chong, thong cong, chong cong
thien anh » tien anh, thien thanh, thien chanh
hanh tang » anh tang, hanh mang, hanh tung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 ((thien danh) or (thien anh)) - ((hanh tang) OR (hanh trang)) luan phong cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((thien danh) OR (thien anh)) - ((hanh tang) OR (hanh trang)) luan phong cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((thien danh) or (thien anh)) - ((hanh tang) OR (hanh trang)) luan phong cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((thien danh) or (thien anh)) - ((hanh tang) OR (hanh trang)) luan phong cong tac toan cao*.