Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
ban hanh » ban hang
chat doc » chat hoc, chau doc, thuat doc
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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) or (sac ky)) nang x hoi. hieu ve ((chat doc) or (chet duoc)) ban hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. hieu ve ((chat doc) OR (chet duoc)) ban hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x hoi. hieu ve ((chat doc) or (chet duoc)) ban hanh vi cua te*.