Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
mach hoc » cach hoc, dich hoc, anh hoc
pho cong » pho uong, cho cong, pho dong
cong dac » cong tac, cong dan, cong cac
van nhan » van phan, van thanh, danh nhan
nhan van » nhan dan, nhan va, phan van
hoi van » hoi va, hoi dan, hai van
mo hoc » mon hoc, co hoc
dac xa » tac xa, cac xa, dan xa

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 thuc)) tap, nghien cuu mo hoc pho cong dac xa hoi van nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (cach thuc)) tap, nghien cuu mo hoc pho cong dac xa hoi van nhan van.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (cach thuc)) tap, nghien cuu mo hoc pho cong dac xa hoi van nhan van*.