Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
hanh thang » nhanh thang, hanh trang, danh thang
hieu quan » hieu qua, lieu quan, thien quan
nang cong » dang cong, bang cong, hang cong
dan chan » dan gian, dan ca, van chat
chan ban » can ban, chat ban, chan nan
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu quan - ((hanh thang) or (thanh thang)) va ((nang cong) OR (nang song)) dan chan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quan - ((hanh thang) OR (thanh thang)) va ((nang cong) OR (nang song)) dan chan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quan - ((hanh thang) or (thanh thang)) va ((nang cong) OR (nang song)) dan chan ban".
• Adding a wildcard symbol may retrieve word variants: ho hieu quan - ((hanh thang) or (thanh thang)) va ((nang cong) OR (nang song)) dan chan ban*.