Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vii » hanh voi, hanh va, hanh noi
ky lang » ky dang, ky tang, tay lang
man hoi » man hoai, dan hoi, van hoi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
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: thu sach ((ky lang) OR (ky nang)) man hoi. hieu ve pham duc va ((hanh vii) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky nang)) man hoi. hieu ve pham duc va ((hanh vii) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) OR (ky nang)) man hoi. hieu ve pham duc va ((hanh vii) or (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) OR (ky nang)) man hoi. hieu ve pham duc va ((hanh vii) or (hanh vi)) cuu tre*.