Perhaps you should try some spelling variations:
qua pham » quan pham, quy pham, qua cham
pham dua » pham duc, pham duy, pham cua
dua tren » dung tren
hanh vai » hanh vi, hanh va, hanh tai
dang xay » dang van, van xay
ban hanh » ban hang
sach thu » sach thue, sach thieu, sach tham
su sach » so sach, vu sach
dua ban » dia ban, cua ban, qua ban
dang xa » lang xa, dang ha, dang va
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: su sach thu ((dang xa) OR (dang xay)) hoi. hieu qua pham dua ban hanh vai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((dang xa) OR (dang xay)) hoi. hieu qua pham dua ban hanh vai ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((dang xa) OR (dang xay)) hoi. hieu qua pham dua ban hanh vai ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((dang xa) OR (dang xay)) hoi. hieu qua pham dua ban hanh vai ((dua tren) or (cua te))*.