Perhaps you should try some spelling variations:
xach tay » canh tay
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
duc van » duc va, duc tan, duc manh
ca viet » va viet, co viet, hoa viet
nang o » nang co, nang ho, nang ro
lai ca » lai cua, lai cam, loai ca
o hai » co hai, so hai, o lai

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 ((xach tay) OR (sach y)) nang o hai. hieu van cham duc van hanh lai ca viet~.
• Adding a wildcard symbol may retrieve word variants: tu ((xach tay) or (sach y)) nang o hai. hieu van cham duc van hanh lai ca viet*.