Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, hang di
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
le tam » le tai, le ham, le nam
di cua » dai cua, doi cua, de cua
le ta » le tai, le va

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 ky nang xa hoi. hieu ((le tam) or (le ta)) thuc vat hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang xa hoi. hieu ((le tam) OR (le ta)) thuc vat hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang xa hoi. hieu ((le tam) or (le ta)) thuc vat hanh di cua viet*.