Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
hoc van » hoc dan, hoc va, hoc vat
minh ve » dinh ve, minh va, kinh ve
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua tu » cua tuc, cua cu, cua te
cua su » qua su
x hoi » xa hoi, o hoi, x ho

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: tu sac ky nang x hoi. ((hieu vu) OR (hieu va)) cham hoc van minh ve ((cua tu) OR (cua su))~.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. ((hieu vu) or (hieu va)) cham hoc van minh ve ((cua tu) or (cua su))*.