Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
ban thoi » ban thi, ban thai, ban toi
thoi dai » hoc dai, hoi dap, hoi dan
toan hoc » van hoc, hoa hoc, tin hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
nhan tai » hang tai, van tai, toan tai
thu ban » thu hang
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ban thoi dai, nghien huu ((toan hoc) OR (toan khoa)) dan khoa hoc xa hai van nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ban thoi dai, nghien huu ((toan hoc) OR (toan khoa)) dan khoa hoc xa hai van nhan tai".
• Adding a wildcard symbol may retrieve word variants: thu ban thoi dai, nghien huu ((toan hoc) OR (toan khoa)) dan khoa hoc xa hai van nhan tai*.