Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
goc nhan » ngoc nhan, goc nhin, hoc nhan
dan phan » doan phan, dan chan, van phan
phan van » pham van, thanh van, luan van
hoc hoi » hoc khoi, hoc hoa, hoc noi
hoi tai » hoc tai, hoi trac
hoi dan » hoa dan, hoc dan, hoi dap
tu hoc » te 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 hoc hoi tai, nghien cua mot goc nhan ((khoa hoc) OR (hoa hoc)) xa hoi dan phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu hoc hoi tai, nghien cua mot goc nhan ((khoa hoc) OR (hoa hoc)) xa hoi dan phan van".
• Adding a wildcard symbol may retrieve word variants: tu hoc hoi tai, nghien cua mot goc nhan ((khoa hoc) OR (hoa hoc)) xa hoi dan phan van*.