Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
tran hoang » tran hong, quan hoang, tran quang
hien xanh » hien hanh, chieu xanh, hien khanh
lang cong » dang cong, hang cong, lang dong
bang cong » dang cong, bang song, hang cong
hoang va » hoang van, hang va, hoang ha
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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)) - tran hoang va ((lang cong) or (bang cong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - tran hoang va ((lang cong) OR (bang cong)) dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien nhanh)) - tran hoang va ((lang cong) or (bang cong)) dan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien nhanh)) - tran hoang va ((lang cong) or (bang cong)) dan than cau*.