Perhaps you should try some spelling variations:
thanh nhan » thanh phan, thanh san, thanh toan
hoa nhanh » hoc nhanh, hoa thanh, hoa khanh
hoc thanh » hoc nhanh, hoan thanh, hoc phan
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong hoa » dong hoa, dong hoc, hang hoa
so sach » so sanh, bo sach, co sach
nhan va » nhan tai, nhan dan, nhan tao
ma hoc » va hoc, ma hoa, mo hoc

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 hoc tap, nghien cuu cong hoa nhanh ((khoa hoc) or (hoa hoc)) ma hoc thanh nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoc tap, nghien cuu cong hoa nhanh ((khoa hoc) OR (hoa hoc)) ma hoc thanh nhan va.
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cuu cong hoa nhanh ((khoa hoc) or (hoa hoc)) ma hoc thanh nhan va*.