Perhaps you should try some spelling variations:
thanh hoa » thanh pho
thanh hai » thanh phan, thanh san
toc sach » hoc sach, doc sach, thuoc sach
mai khoi » mai khoa, tai khoa, cac khoi
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
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: toc sach ((y nang) or (ly nang)) mai khoi. hieu va cam duc va ((thanh hai) or (thanh hoa)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y nang) OR (ly nang)) mai khoi. hieu va cam duc va ((thanh hai) OR (thanh hoa)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (ly nang)) mai khoi. hieu va cam duc va ((thanh hai) or (thanh hoa)) cua tre*.