Perhaps you should try some spelling variations:
nhanh dong » hanh dong, nhanh chong, anh dong
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nhanh » hoc nganh, hoc phan
chu dich » chu tich, chu dinh, chu thich
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
thuoc ma » hoc ma, duoc ma
cac nhan » cac nha, cam nhan, dac nhan
ma hoc » va hoc, ma hoa, mo hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: chu dich hoc tap, nghien cuu toan hoc nhanh dong thuoc ma hoc ((cac nhan) OR (ca nhan)) dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "chu dich hoc tap, nghien cuu toan hoc nhanh dong thuoc ma hoc ((cac nhan) OR (ca nhan)) dan".
• Adding a wildcard symbol may retrieve word variants: chu dich hoc tap, nghien cuu toan hoc nhanh dong thuoc ma hoc ((cac nhan) OR (ca nhan)) dan*.