Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
phan khong » phan hong, nhan khong, pham khong
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, cac cong
hoc phan » hoc dan, hoc pho
thuoc xa » thuoc ma, thuoc va, thuoc la
nhan tai » hang tai, van tai, toan tai
vu sach » vu bach, su sach, vu khach
hoi ca » hoi cua, hoi cac, hoi cau

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

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