Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh di » hanh de, hang di, danh di
vuc van » duc van, luc van, thuc van
hoc sac » hoc sach, hoc cac, hoc mac
ve chat » va chat, van chat
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sac ky nang ma hoi. hieu ((ve chat) or (va cac)) vuc van ((hanh di) or (hanh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang ma hoi. hieu ((ve chat) OR (va cac)) vuc van ((hanh di) OR (hanh vi)) cua viet.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang ma hoi. hieu ((ve chat) or (va cac)) vuc van ((hanh di) or (hanh vi)) cua viet*.