Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hien nhanh » thien thanh, tien thanh, dien thanh
thong cong » trong cong, tong cong, thong thong
hien hanh » dieu hanh
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
cong dao » cuong dao, cong dan, dong dao
dao van » do van, dang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((chieu sang) or (hien nhanh))) or (hien hanh)) - canh tranh va thong cong dao van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((chieu sang) OR (hien nhanh))) OR (hien hanh)) - canh tranh va thong cong dao van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((((chieu sang) or (hien nhanh))) or (hien hanh)) - canh tranh va thong cong dao van ban*.