Perhaps you should try some spelling variations:
may thoi » gay thoi, may thi, tay thoi
ky mang » ky nang, ke mang, ky dang
hieu ve » hieu va, hieu van
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
ve hoc » te hoc, va hoc, vi hoc
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua
nuoc » quoc, duoc, ngoc

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 mang may thoi. hieu ve hoc nuoc ((va dan) OR (va tinh)) vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: vu sac ky mang may thoi. hieu ve hoc nuoc ((va dan) or (va tinh)) vi cua tre*.