Perhaps you should try some spelling variations:
quan pham » tuan pham, quan phap, quang phat
hieu quan » hieu qua, lieu quan, thien quan
hanh vai » hanh vi, hanh va, hanh tai
vu sach » vu bach, su sach, vu khach
sach tu » sach thu, cach tu, sach ty
tu dang » thu dang, tu dong, su dang
dang xa » dang xay, lang xa, dang ha
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
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 tu dang xa hoi. hieu quan pham ((duc ban) OR (duc van)) hanh vai ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tu dang xa hoi. hieu quan pham ((duc ban) OR (duc van)) hanh vai ((cua tre) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tu dang xa hoi. hieu quan pham ((duc ban) OR (duc van)) hanh vai ((cua tre) or (cua tu))*".