Perhaps you should try some spelling variations:
khang thuoc » dang thuoc, hanh thuoc, khau thuoc
khong thuoc » hong phuoc, dong thuoc, khoa thuoc
hoc nhanh » hoc nganh, hoc phan
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
bai phap » ban phap, giai phap, bai tap
phap vat » phap luat, phap phat, phap viet
tu sach » thu sach, su sach, te sach
hoi bai » hoc bai, hoi tai, khoi bay
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: tu sach hoc tap, nghien cuu dong hoc nhanh ((khang thuoc) OR (khong thuoc)) va hoi bai phap vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu dong hoc nhanh ((khang thuoc) OR (khong thuoc)) va hoi bai phap vat".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong hoc nhanh ((khang thuoc) OR (khong thuoc)) va hoi bai phap vat*.