Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nang doc » nang luc
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
doc hoi » duoc hoi, hoc hoi, doc hai
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
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: ((su sach) or (vu khach)) ky nang doc hoi. hieu va cam tu ((va hanh) OR (van hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) ky nang doc hoi. hieu va cam tu ((va hanh) OR (van hanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) ky nang doc hoi. hieu va cam tu ((va hanh) OR (van hanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky nang doc hoi. hieu va cam tu ((va hanh) OR (van hanh)) vi cua tre*.