Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
mai khoi » mai khoa, tai khoa, cac khoi
vu sach » vu bach, su sach, vu khach
mai hoi » dai hoi, lai hoi, mai doi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
vu sac » vu san, va sac, vu cac
vi cua » vai cua, di cua
cua te » cua tu
van am » van nam, van lam, van dam

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