Perhaps you should try some spelling variations:
khang thuoc » khong thuoc, dang thuoc, hanh thuoc
nhanh khang » nhanh thang, nhanh quang, nhanh thanh
thong hoc » thuong hoc, tuong hoc, thong hoa
sach hoc » cach hoc, sach hoi, mach hoc
tong hoc » tuong hoc, trong hoc, tong hop
thuoc va » thuc va, thuoc ma, thuong va
phap vat » phap luat, phap phat, phap viet
tu sach » thu sach, su sach, te sach
doi ban » di ban, do ban, dong ban
va doi » va dai, va doc, va do

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 ((tong hoc) OR (thong hoc)) nhanh khang thuoc va doi ban phap vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu ((tong hoc) OR (thong hoc)) nhanh khang thuoc va doi ban phap vat".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu ((tong hoc) OR (thong hoc)) nhanh khang thuoc va doi ban phap vat*.