Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
cong thuoc » cong thuc, dong thuoc, long thuoc
van thanh » ban thanh, van tuan
thanh van » thanh san, thanh toan, thanh phan
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
toan hoc » toan khoa, hoa hoc, tin hoc
thuoc ma » hoc ma, duoc ma
van hoc » van hoa
hoc van » hoc dan, hoc va, hoc vat
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: thu mach hoc tap, nghien cuu ((toan hoc) OR (van hoc)) nganh cong thuoc ma hoc van thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu mach hoc tap, nghien cuu ((toan hoc) OR (van hoc)) nganh cong thuoc ma hoc van thanh van".
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu ((toan hoc) OR (van hoc)) nganh cong thuoc ma hoc van thanh van*.