Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vat hanh » vat thanh, van hanh, va hanh
cao hoi » cau hoi, co hoi, cao hoc
vu sac » vu sach, va sac, vu cac
vu san » va san, vu ban
van am » van nam, van lam, van dam
vi cua » vai cua, di cua
cua te » cua tu
thuc » thu

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 am thuc vat 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 am thuc vat hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sac) OR (vu san)) ky nang cao hoi. hieu van am thuc vat hanh vi cua te*.