Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
anh quang » anh xquang, anh quan, nhanh quang
dung cong » dung trong
quang va » quang van, quan va, quang ma
cong van » cong vang, cong san, song van
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
va dung » van dung, va duong, vat dung

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 - anh quang va dung cong van ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - anh quang va dung cong van ((toan tai) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - anh quang va dung cong van ((toan tai) or (toan ban))*.