Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
soc van » hoc van, oc van, sac van
hanh va » hang va, hanh vi
ca tren » cau tren, cu tren, la tren
x hoi » xa hoi, o hoi, 5 hoi
va ca » va cac, va cao, va cai

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 ky nang ((x hoi) or (x ho)). ((hieu ve) or (lieu va)) cham soc van hanh va ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (x ho)). ((hieu ve) OR (lieu va)) cham soc van hanh va ca tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (x ho)). ((hieu ve) or (lieu va)) cham soc van hanh va ca tren*.