Perhaps you should try some spelling variations:
nhanh dung » nhanh dong, hanh dung, nhanh hung
trong hach » trong mach, trong cach, trong hanh
hieu lang » chieu sang, hieu quang, nhieu tang
luan dung » lan dung, luan dong, luan hung
hoc hieu » hoc thieu, hoc hien, doc hieu
hach van » bach van, cach van, hanh van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - nhanh dung luan dung trong hach van ban~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - nhanh dung luan dung trong hach van ban*.