Perhaps you should try some spelling variations:
nhanh chong » thanh cong, khanh phong
nhanh song » nhanh dong, phan song, thanh son
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
phuoc va » thuoc va, phuc va, phuong va
tu sach » thu sach, su sach, te sach
hoi ban » hoi dan, hoi bai, doi ban
va hoi » xa hoi, va hoc, va hoa
phap » phan, pham

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 cong hoc ((nhanh chong) or (nhanh song)) phuoc va hoi ban phap viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu cong hoc ((nhanh chong) OR (nhanh song)) phuoc va hoi ban phap viet.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu cong hoc ((nhanh chong) or (nhanh song)) phuoc va hoi ban phap viet*.