Perhaps you should try some spelling variations:
nhanh khong » nhanh chong, nganh khong, nhan khong
mach hoc » cach hoc, dich hoc, anh hoc
cuu long » cuu cong, cuu tong, cuu nang
co nhanh » co thanh, co hanh, co phanh
thuoc xa » thuoc va, thuoc la, thuoc tai
thuoc ma » hoc ma, duoc ma
hang tai » hang va, dung tai
tu mach » tu cach, tu manh, tu hach
long co » dong co, cong co, lang co
va hang » van hang, va nang, va lang

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 long co nhanh khong ((thuoc xa) OR (thuoc ma)) hoi va hang tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu long co nhanh khong ((thuoc xa) OR (thuoc ma)) hoi va hang tai".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu long co nhanh khong ((thuoc xa) OR (thuoc ma)) hoi va hang tai*.