Perhaps you should try some spelling variations:
luc nhanh » luc nhan, luc nganh, luc nhat
chong hoc » chung hoc, chong doc, thong hoc
mach hoc » cach hoc, dich hoc, anh hoc
cuu tong » cuu cong, cuu tinh, huu tung
hoi benh » hoc benh, hoa benh, hoi binh
tu mach » tu cach, tu manh, tu hach
benh va » benh ve, benh dai, benh tai
hoc xa » hoc ma
va tai » va tac, va tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu mach hoc tap, nghien cuu tong ((luc nhanh) OR (luc canh)) chong hoc xa hoi benh va tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu tong ((luc nhanh) OR (luc canh)) chong hoc xa hoi benh va tai".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu tong ((luc nhanh) OR (luc canh)) chong hoc xa hoi benh va tai*.