Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
cham duc » pham duc, pham duy, phan duc
tinh hai » tinh thai, tinh chat, trinh han
tu sach » thu sach, su sach, te sach
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
hai cuu » hai cua, hai chu, hai cuc
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu hang xa hoi. hieu va ((cham duc) or (cham soc)) may tinh hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hang xa hoi. hieu va ((cham duc) OR (cham soc)) may tinh hai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach thu hang xa hoi. hieu va ((cham duc) or (cham soc)) may tinh hai cuu tre*.