Perhaps you should try some spelling variations:
dan khanh » dang khanh, van khanh, dat khanh
van nham » van nhan, van tham, van pham
dan hanh » dang hanh, dan thanh, ban hanh
cac tren » ca tren, cau tren, rac tren
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky nang x hoi. thien ((van nham) OR (van nam)) thuc ((dan hanh) or (dan khanh)) va cac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky nang x hoi. thien ((van nham) OR (van nam)) thuc ((dan hanh) OR (dan khanh)) va cac tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky nang x hoi. thien ((van nham) OR (van nam)) thuc ((dan hanh) or (dan khanh)) va cac tren".
• Adding a wildcard symbol may retrieve word variants: co sach ky nang x hoi. thien ((van nham) OR (van nam)) thuc ((dan hanh) or (dan khanh)) va cac tren*.