Perhaps you should try some spelling variations:
bach ky » bac ky
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va tich » va tinh, va dich
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ky dang xa hoi. hieu va cau truc va tich va ((cua tre) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky dang xa hoi. hieu va cau truc va tich va ((cua tre) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: vu bach ky dang xa hoi. hieu va cau truc va tich va ((cua tre) or (cua vat))*.