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