Perhaps you should try some spelling variations:
toan hoat » toan khoa, toan ho, dan hoat
dang nhan » dung nhan, dang nhat, danh nhan
thu canh » thu cong, thu ban, thu hang
thoi dai » hoc dai, hoi dap, hoi dan
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
hoc toan » hoc tan, hop toan, hoa toan
hoat hoc » hoa hoc, hoat ho, khoa hoc
hai dang » hai bang, dai dang, hoi dang
nhan tai » hang tai, van tai, toan tai
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 canh) OR (thuc hanh)) thoi dai, nghien cuu toan hoc toan hoat hoc xa hai dang nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu canh) OR (thuc hanh)) thoi dai, nghien cuu toan hoc toan hoat hoc xa hai dang nhan tai".
• Adding a wildcard symbol may retrieve word variants: ((thu canh) OR (thuc hanh)) thoi dai, nghien cuu toan hoc toan hoat hoc xa hai dang nhan tai*.