Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nganh hai
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
nhanh ha » thanh hoa, thanh hai, khanh hoa
dat gian » dan gian, dat gia, dam gian
gian dan » gian lang
su sach » so sach, vu sach
hoi dat » hoi dap, hoi dan, hoc 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: su sach hoc tap, nghien cuu dong hoc ((nhanh ha) or (nhanh hai)) hoc xa hoi dat gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoc tap, nghien cuu dong hoc ((nhanh ha) OR (nhanh hai)) hoc xa hoi dat gian dan.
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu dong hoc ((nhanh ha) or (nhanh hai)) hoc xa hoi dat gian dan*.