Perhaps you should try some spelling variations:
thi nghiem » thuc nghiem
nghiem dan » nghiem ban, nghiem van, nghiem dau
khac thai » khac trai, khac thi, khach trai
nghe duoc » nghiem duoc, nghe nuoi, che duoc
duoc hoc » quoc hoi
phai thi » pham thi, phan thi, phap thi
tu khac » vu khac, su khac, ta khac
tu phai » tu phat, tu phap, cu phai
dan hoc » van hoc, dan toc, dai hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu khac thai nghe duoc hoc ) or ( tu phai thi nghiem dan hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu khac thai nghe duoc hoc ) OR ( tu phai thi nghiem dan hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu khac thai nghe duoc hoc ) or ( tu phai thi nghiem dan hoc ))*.