Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
thanh hang » thanh hoang, thanh thang, tranh hang
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong van » cong vang, cong san, song van
toan tai » toan tap, doanh tai, toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - thanh hang va nhung cong van ((toan tai) OR (van ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - thanh hang va nhung cong van ((toan tai) or (van ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - thanh hang va nhung cong van ((toan tai) or (van ban))*.