Perhaps you should try some spelling variations:
nhanh chong » thanh cong, khanh phong
nhanh thong » nhanh thang, nhan thong, nhanh hong
sach doi » sach hoi, sach moi, sach dao
so sach » so sanh, bo sach, co sach
doi tai » hoi tai, dai tai, doi tac
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
hoi dan » hoa dan, hoc dan, hoi dap
dan van » dang van, doan van, dao van
van tai » von tai, van tuan
ma hoi » mai hoi, xa hoi, ma hoa

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 doi tai, nghien cuu mot hoc ((nhanh thong) or (nhanh chong)) hoc ma hoi dan van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach doi tai, nghien cuu mot hoc ((nhanh thong) OR (nhanh chong)) hoc ma hoi dan van tai*.