Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
nhanh khong » nhanh chong, nganh khong, nhan khong
sach duoc » sach nuoc, sach dao, sach dung
hoc nhanh » hoc nganh, hoc phan
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
thuoc va » thuc va, thuoc ma, thuong va
phap vat » phap luat, phap phat, phap viet
hoi ban » hoi dan, hoi bai, doi ban
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach duoc) or (mach hoc)) tap, nghien cuu dong hoc nhanh khong thuoc va hoi ban phap vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach duoc) OR (mach hoc)) tap, nghien cuu dong hoc nhanh khong thuoc va hoi ban phap vat.
• Adding a wildcard symbol may retrieve word variants: so ((sach duoc) or (mach hoc)) tap, nghien cuu dong hoc nhanh khong thuoc va hoi ban phap vat*.