Perhaps you should try some spelling variations:
nang doc » nang luc
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, ban hanh
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
doc hoi » duoc hoi, hoc hoi, doc hai
cam tu » cam thu, nam tu, dam tu
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (vay khach)) ky nang doc hoi. hieu va cam tu ((va hanh) OR (va danh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vay khach)) ky nang doc hoi. hieu va cam tu ((va hanh) OR (va danh)) vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vay khach)) ky nang doc hoi. hieu va cam tu ((va hanh) OR (va danh)) vai cua tre*".