Perhaps you should try some spelling variations:
thu hang » thi hang, thuc hanh, thu huong
tinh hai » tinh thai, tinh chat, trinh han
tu sach » thu sach, su sach, te sach
tu hang » tu hanh, tu hung, ty hang
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va tinh » may tinh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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 ((tu hang) or (thu hang)) xa hoi. hieu va pham duc va tinh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu hang) OR (thu hang)) xa hoi. hieu va pham duc va tinh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu hang) or (thu hang)) xa hoi. hieu va pham duc va tinh hai cua tre*.