Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu manh » hieu nganh, dieu hanh, hien hanh
tranh van » tran van, trinh van, thanh van
hang cong » dang cong, hang nong, bang cong
cong toan » cong tan, cong hoan, cong tuan
toan phan » thanh phan, toan ban, hoa phan
tranh va » trang va, trinh va, thanh va
phan cau » phan dau, phan cac, phan tu

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