Perhaps you should try some spelling variations:
trinh voi » trinh hoi, trinh vi, trinh boi
nuoc may » nuoc my, nuoc mat, nuoc man
tinh voi » tinh doi, binh voi, minh voi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi
ve hoc » te hoc, va hoc, vi hoc

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: vu sac ky nang ((ma hoi) OR (ma hoa)). hieu ve hoc nuoc may ((tinh voi) OR (trinh voi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((ma hoi) or (ma hoa)). hieu ve hoc nuoc may ((tinh voi) OR (trinh voi)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang ((ma hoi) or (ma hoa)). hieu ve hoc nuoc may ((tinh voi) OR (trinh voi)) cua tre*.