Perhaps you should try some spelling variations:
mach hoc » dich hoc, anh hoc, bac hoc
cach hoc » cach thuc, cach thoi, dich hoc
pho uong » pho thong
uong dan » huong dan, tuong dan, xuong dan
dan nhan » danh nhan, dan chan, van nhan
hoi dan » hoa dan, hoc dan, hoi dap
nhan va » nhan tai, nhan dan, nhan tao
cuu mo » cuu mot, cuu ho, cuu ma
mo hoc » mon hoc, co hoc
dan xa » dan xac, dan xay, dan ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((mach hoc) or (cach hoc)) tap, nghien cuu mo hoc pho uong dan xa hoi dan nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (cach hoc)) tap, nghien cuu mo hoc pho uong dan xa hoi dan nhan va.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (cach hoc)) tap, nghien cuu mo hoc pho uong dan xa hoi dan nhan va*.