Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
va tinh » may tinh
tinh de » tinh da, sinh de, tinh he
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
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang ((ma hoi) or (ma hoa)). hieu ve ((dat nuoc) or (hoc nuoc)) va tinh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((ma hoi) OR (ma hoa)). hieu ve ((dat nuoc) OR (hoc nuoc)) va tinh de cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang ((ma hoi) or (ma hoa)). hieu ve ((dat nuoc) or (hoc nuoc)) va tinh de cua tre*.