Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nhan khong » nhan thong, nhanh chong, nhan khoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu long » cuu cong, cuu tong, cuu nang
thuoc xa » thuoc ma, thuoc va, thuoc la
tu mach » tu cach, tu manh, tu hach
long co » dong co, cong co, lang co
van tai » von tai, van tuan

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 ((nhan khong) or (nganh khong)) thuoc xa hoi va van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu long co ((nhan khong) OR (nganh khong)) thuoc xa hoi va van tai.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu long co ((nhan khong) or (nganh khong)) thuoc xa hoi va van tai*.