Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hang » van khang, van hoang, van thang
thu sac » thu san, thu xac, thu dac
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi
va nam » van nam, ha nam, va nay
nam vo » nam bo, nam so, nam va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sac) or (thu sach)) ky nang ((ma hoi) or (ma hoa)). lieu va nam vo van hang va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sac) OR (thu sach)) ky nang ((ma hoi) OR (ma hoa)). lieu va nam vo van hang va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sac) or (thu sach)) ky nang ((ma hoi) or (ma hoa)). lieu va nam vo van hang va cua tre*.