Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cam duc » cam xuc, cao duc, pham duc
cuu tre » cua tre, cau tren, cau treo
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
van cam » van nam, van lam, van cau
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
cua te » cua tu

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 xa hoi. hieu van cam duc van hanh di ((cuu tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu van cam duc van hanh di ((cuu tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang xa hoi. hieu van cam duc van hanh di ((cuu tre) or (cua te))*.