Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
khoa hoc » hoa hoc
lang dau » hang dau, xang dau, nang dau
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va lang » va nang, hoa lang
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach hoc) OR (cach hoc)) tap, nghien cuu mon hoc doanh khoa hoc xa hoi va lang dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach hoc) OR (cach hoc)) tap, nghien cuu mon hoc doanh khoa hoc xa hoi va lang dau".
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) OR (cach hoc)) tap, nghien cuu mon hoc doanh khoa hoc xa hoi va lang dau*.