Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thong cong » trong cong, tong cong, thong thong
hieu manh » hieu nganh, dieu hanh, hien hanh
trinh cua » trinh luat, trinh quan, trinh luan
cong dang » cong dong, cong dan, cong dung
tinh cua » sinh cua, tinh chat, tranh cua
dang van » hoang van, hang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (chieu xanh)) - hanh ((tinh cua) OR (trinh cua)) thong cong dang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - hanh ((tinh cua) OR (trinh cua)) thong cong dang van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (chieu xanh)) - hanh ((tinh cua) OR (trinh cua)) thong cong dang van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu xanh)) - hanh ((tinh cua) OR (trinh cua)) thong cong dang van ban*.