Perhaps you should try some spelling variations:
nhanh hoan » thanh hoang, thanh hoa, khanh hoa
nhanh hoa » thanh hoa, khanh hoa, nhanh ha
sach hoc » cach hoc, sach hoi, mach hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
dac nhan » cac nhan, danh nhan, ca nhan
nhan dan » phan dau, gian dan, nhan tai
vu sach » vu bach, su sach, vu khach
hoi dac » hoi dap, hoi dan, hoi dat
hoc xa » hoc ma

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach hoc tap, nghien cuu tong hoc ((nhanh hoa) or (nhanh hoan)) hoc xa hoi dac nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach hoc tap, nghien cuu tong hoc ((nhanh hoa) OR (nhanh hoan)) hoc xa hoi dac nhan dan.
• Adding a wildcard symbol may retrieve word variants: vu sach hoc tap, nghien cuu tong hoc ((nhanh hoa) or (nhanh hoan)) hoc xa hoi dac nhan dan*.