Perhaps you should try some spelling variations:
pham cac » phan cac, pham ca, pham can
ban hanh » ban hang
hanh dai » hanh tai, hanh dao, vanh dai
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
cac ban » cac dan, cac van, can ban
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
my hoc » ly hoc, mo hoc, mi hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((co hoi) or (((y hoc) or (my hoc)))). hieu va pham cac ban hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((co hoi) OR (((y hoc) OR (my hoc)))). hieu va pham cac ban hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((co hoi) or (((y hoc) or (my hoc)))). hieu va pham cac ban hanh dai cua tre*.