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
ty dang » ty xang, ky dang, ty hang
dang xa » dang xay, lang xa, dang ha
duc ban » duc tan, duc van, duc man
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
dua ban » dia ban, cua ban, qua ban
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 ty dang xa hoi. hieu quan 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 ty dang xa hoi. hieu quan pham ((duc ban) OR (dua ban)) hanh vai ((cua tre) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty dang xa hoi. hieu quan pham ((duc ban) OR (dua ban)) hanh vai ((cua tre) or (cua tu))*".