Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
cao hoi » cau hoi, co hoi, cao hoc
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vu sac » vu sach, va sac, vu cac
vu san » va san, vu ban
vi cua » vai cua, di cua
cua te » cua tu

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) or (vu san)) ky nang cao hoi. ((hieu van) OR (lieu va)) am thuc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sac) OR (vu san)) ky nang cao hoi. ((hieu van) OR (lieu va)) am thuc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sac) or (vu san)) ky nang cao hoi. ((hieu van) OR (lieu va)) am thuc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sac) or (vu san)) ky nang cao hoi. ((hieu van) OR (lieu va)) am thuc va hanh vi cua te*.