Perhaps you should try some spelling variations:
chong thuoc » khong thuoc, cong thuc, hong phuoc
phan chong » phan cong, phan hong, phap chong
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
hoc phan » hoc dan, hoc pho
thuoc xa » thuoc ma, thuoc va, thuoc la
nhan tai » hang tai, van tai, toan tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi cua » hoi chuc
nhan va » nhan dan, nhan tao, phan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu mach hoc tap, nghien cuu mon hoc phan chong thuoc xa hoi cua ((nhan va) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu mach hoc tap, nghien cuu mon hoc phan chong thuoc xa hoi cua ((nhan va) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu mon hoc phan chong thuoc xa hoi cua ((nhan va) or (nhan tai))*.