Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hang khoa » dung khoa
thu hang » thi hang, thuc hanh, thu huong
danh hoa » thanh hoa, khanh hoa, nganh hoa
nhan dan » phan dau, gian dan, nhan tai
te sinh » ve sinh, he sinh, ke sinh
va hoc » van hoc
hoc ca » hoc cao, hoc cua, hoc cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sinh hoc tap, nghien thu hang va ((danh hoa) or (hang khoa)) hoc va hoc ca nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sinh hoc tap, nghien thu hang va ((danh hoa) OR (hang khoa)) hoc va hoc ca nhan dan.
• Adding a wildcard symbol may retrieve word variants: te sinh hoc tap, nghien thu hang va ((danh hoa) or (hang khoa)) hoc va hoc ca nhan dan*.