Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
danh gian » dan gian, danh gia, danh giao
khoa hoc » hoa hoc
gian dan » gian lang
ban thi » dan thi, can thi, tran thi
van thi » van tai, dan thi, van thu
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
ma hop » mau hop, ma hoa, va hop

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 thi) OR (van thi)) dap, nghien cuu mon hoc doanh khoa hoc ma hop danh gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((ban thi) OR (van thi)) dap, nghien cuu mon hoc doanh khoa hoc ma hop danh gian dan".
• Adding a wildcard symbol may retrieve word variants: thu ((ban thi) OR (van thi)) dap, nghien cuu mon hoc doanh khoa hoc ma hop danh gian dan*.