Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » thong cong, hang cong, nhung don
hien xanh » hien hanh, chieu xanh, hien khanh
trung cap » truong cao, trung tam
dung cong » dung trong
dan chan » dan gian, dan ca, van chat
chan nan » chan nhan, chang nang, chan doan

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) OR (hien nhanh)) - hanh trung cap ((nhung cong) or (dung cong)) dan chan nan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - hanh trung cap ((nhung cong) OR (dung cong)) dan chan nan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien nhanh)) - hanh trung cap ((nhung cong) or (dung cong)) dan chan nan".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien nhanh)) - hanh trung cap ((nhung cong) or (dung cong)) dan chan nan*.