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