Perhaps you should try some spelling variations:
vien nganh » vien thanh
chieu sang » chieu sach, chieu xanh, hieu lang
thong cong » trong cong, tong cong, thong thong
hanh tang » hanh trang, anh tang, hanh mang
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
tang va » trang va, tang van, thang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((vien nganh) or (chieu sang)) - hanh tang va thong cong dan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((vien nganh) OR (chieu sang)) - hanh tang va thong cong dan ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo ((vien nganh) or (chieu sang)) - hanh tang va thong cong dan ((toan cau) or (toan cao))*.