Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
mach hoc » cach hoc, dich hoc, anh hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
tinh van » trinh van, dinh van, tinh va
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
hoc cuu » hoc huu, hoc cua, hoc cau
hoc xa » hoc ma
xa hoc » xa hoi, va hoc, xa hoa

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 duoc) or (mach hoc)) tap, nghien cuu mot hoc dan khoa hoc xa hoc cuu tinh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach duoc) OR (mach hoc)) tap, nghien cuu mot hoc dan khoa hoc xa hoc cuu tinh van.
• Adding a wildcard symbol may retrieve word variants: tu ((sach duoc) or (mach hoc)) tap, nghien cuu mot hoc dan khoa hoc xa hoc cuu tinh van*.