Perhaps you should try some spelling variations:
thuc day » thuc vat
thuc dan » thuc hanh, hoc dan, thuc vat
danh de » hanh de, dan de, dang de
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hieu ve » hieu van
sai ky » sac ky
de cua » le cua, te cua, dieu cua
vu sai » vu hai, vu san, vu dai
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sai ky nang x hoi. ((hieu ve) or (hieu va)) cam ((thuc day) OR (thuc dan)) danh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sai ky nang x hoi. ((hieu ve) OR (hieu va)) cam ((thuc day) OR (thuc dan)) danh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sai ky nang x hoi. ((hieu ve) or (hieu va)) cam ((thuc day) OR (thuc dan)) danh de cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sai ky nang x hoi. ((hieu ve) or (hieu va)) cam ((thuc day) OR (thuc dan)) danh de cua tre*.