Perhaps you should try some spelling variations:
quang trong » quang truong, quang trung, quan trong
tranh tran » thanh tran, tranh toan, tranh tren
chuan chon » chan cho, chuan chat, chuan chau
hien xanh » hien hanh, hien nhanh, chieu xanh
trong dan » trong dang, trong san, trong tan
chan cao » chan cho, chat cao, chay cao

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 - canh tranh tran quang trong dan ((chan cao) or (chuan chon))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh tranh tran quang trong dan ((chan cao) OR (chuan chon)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh tran quang trong dan ((chan cao) or (chuan chon))*.