Perhaps you should try some spelling variations:
quang trong » quang truong, quang trung, quan trong
hanh trang » thanh trung, hanh trinh, minh trang
hiem ngan » kim ngan, viem gan
trong dan » trong dang, trong san, trong tan
hoc hiem » hoc hien, hoc thieu, hoc thiet
than cao » thai cao, than cap, than sao
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hiem ngan - ((hanh trang) or (canh tranh)) tran quang trong dan ((than cao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hiem ngan - ((hanh trang) OR (canh tranh)) tran quang trong dan ((than cao) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc hiem ngan - ((hanh trang) or (canh tranh)) tran quang trong dan ((than cao) or (toan cao))*.