Perhaps you should try some spelling variations:
cuu cong » cua cong, thu cong, cac cong
khoa hoc » hoa hoc
hoi benh » hoc benh, hoa benh, hoi binh
nhan van » nhan dan, nhan va, phan van
cong cu » chung cu
cu toan » cua toan, cuu toan, duc toan
su anh » sua anh, tu anh, su thanh
vu anh » vu khanh, vu thanh
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su anh) OR (vu anh)) hoc tap, nghien cuu cong cu toan khoa hoc ma hoi benh nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su anh) OR (vu anh)) hoc tap, nghien cuu cong cu toan khoa hoc ma hoi benh nhan van".
• Adding a wildcard symbol may retrieve word variants: ((su anh) OR (vu anh)) hoc tap, nghien cuu cong cu toan khoa hoc ma hoi benh nhan van*.