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
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
vu sach » vu bach, su sach, vu khach
duc ban » duc tan, duc van, dua ban
cua tre » cuu tre, cua triet, dua tren
va hoi » xa hoi, va hoc, va hoa
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: vu sach thu hang va hoi. hieu qua pham duc ban hanh vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu hang va hoi. hieu qua pham duc ban hanh vai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: vu sach thu hang va hoi. hieu qua pham duc ban hanh vai ((cua tre) or (cua te))*.