Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
cao hoat » cac hoat, co hoat, cao chat
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (((su sach) or (vu khach)))) ky nang cao hoat. hieu va cam xuc van hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((su sach) OR (vu khach)))) ky nang cao hoat. hieu va cam xuc van hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((su sach) or (vu khach)))) ky nang cao hoat. hieu va cam xuc van hanh vi cua vat*.