Perhaps you should try some spelling variations:
phanh van » phan van, thanh van, khanh van
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
hanh van » thanh van, khanh van, hanh va
te mach » ke mach, te sach, tim mach
hoi cap » hoi dap, hoi cac, hoi cau
mo hoc » mon hoc, co hoc
hoc da » hoc dan, hoc dai, hoc dat
ma hoi » mai hoi, xa hoi, ma hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te mach hoc tap, nghien cuu mo hoc da khoa hoc ma hoi cap ((hanh van) OR (phanh van))~.
• Adding a wildcard symbol may retrieve word variants: te mach hoc tap, nghien cuu mo hoc da khoa hoc ma hoi cap ((hanh van) or (phanh van))*.