Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, trinh thiet, trinh dien
thuc nghiem » trac nghiem
nghiem duoc » nghiem thuoc, nghe duoc
khach thuc » thach thuc, khac phuc, cach thuc
vu khach » vu khanh, vu khac, vay khach
duoc hoi » quoc hoi, duoc hoc, duoc si
bo canh » kho canh
d hoc » du hoc, ad hoc, de hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( bo canh ((trinh nghien) OR (kinh nghiem)) d hoc ) or ( vu khach thuc nghiem duoc hoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bo canh ((trinh nghien) OR (kinh nghiem)) d hoc ) OR ( vu khach thuc nghiem duoc hoi )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( bo canh ((trinh nghien) OR (kinh nghiem)) d hoc ) or ( vu khach thuc nghiem duoc hoi ))".
• Adding a wildcard symbol may retrieve word variants: (( bo canh ((trinh nghien) OR (kinh nghiem)) d hoc ) or ( vu khach thuc nghiem duoc hoi ))*.