Perhaps you should try some spelling variations:
qua pham » quan pham, quy pham, qua cham
hanh vai » hanh vi, hanh va, hanh tai
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky danh » ky anh, ky dang
danh xa » danh ca, dinh xa, canh xa
duc ban » duc tan, duc van, duc man
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet
cua tu » cua tuc, cua su, cua cu

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 ky danh xa hoi. hieu qua pham ((duc ban) or (dua ban)) hanh vai ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky danh xa hoi. hieu qua pham ((duc ban) OR (dua ban)) hanh vai ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky danh xa hoi. hieu qua pham ((duc ban) or (dua ban)) hanh vai ((cua tre) or (cua tu))*.