Perhaps you should try some spelling variations:
khang thuoc » khong thuoc, dang thuoc, hanh thuoc
nhanh khang » nhanh thang, nhanh quang, nhanh thanh
hoc nhanh » hoc nganh, hoc phan
cach hoc » cach thuc, cach thoi, dich hoc
mach hoc » dich hoc, anh hoc, bac hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
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: te ((cach hoc) or (mach hoc)) tap, nghien cuu tong hoc nhanh khang thuoc va hoi ban phap vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((cach hoc) OR (mach hoc)) tap, nghien cuu tong hoc nhanh khang thuoc va hoi ban phap vat.
• Adding a wildcard symbol may retrieve word variants: te ((cach hoc) or (mach hoc)) tap, nghien cuu tong hoc nhanh khang thuoc va hoi ban phap vat*.