Perhaps you should try some spelling variations:
thong thuong » thong thong, hang thuong, tvqg thuong
cong thuong » hang thuong
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh cua » trinh cua, sinh cua, tinh chat
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - hanh tinh cua ((thong thuong) OR (cong thuong)) ((van toan) or (van tan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh tinh cua ((thong thuong) OR (cong thuong)) ((van toan) OR (van tan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh tinh cua ((thong thuong) OR (cong thuong)) ((van toan) or (van tan)) cau*".