Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vat hanh » vat thanh, van hanh, va hanh
vu sach » vu bach, su sach, vu khach
cao hoi » cau hoi, co hoi, cao hoc
hanh di » hanh vi, hanh de, hang di
vu sac » vu san, va sac, vu cac
van am » van nam, van lam, van dam
di cua » dai cua, doi cua, de 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 sach)) ky nang cao hoi. hieu van am thuc vat hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sac) OR (vu sach)) ky nang cao hoi. hieu van am thuc vat hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: ((vu sac) or (vu sach)) ky nang cao hoi. hieu van am thuc vat hanh di cua te*.