Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoa khanh » hoa thanh, hoa phan, hoa hinh
khanh hoa » thanh hoa, hang hoa
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
thu dong » thuy dong, tu dong, thu cong
dong hoa » dong hoc, dong co
cac nhan » ca nhan, cac nha, cam nhan
hoi cac » hoc cac, voi cac, hoa cac
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach hoc) or (mach hoc)) tap, nghien thu dong hoa khanh hoa hoc xa hoi cac nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (mach hoc)) tap, nghien thu dong hoa khanh hoa hoc xa hoi cac nhan va.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (mach hoc)) tap, nghien thu dong hoa khanh hoa hoc xa hoi cac nhan va*.