Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ky dang » ky danh
xay hoi » xa hoi, tay hoi, cay phoi
qua nam » quan nam, quang nam, qua nhat
cua nam » cua tam, cua ngan, cua nhan
va danh » va dinh, va dan, va hanh
danh ve » dinh ve, hanh ve, anh ve
cu tren » tu tren, dua tren
ve cu » ve cau, ve chu, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((ky dang) or (ky nang)) xay hoi. hieu ((qua nam) OR (cua nam)) duc va danh ve cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky dang) OR (ky nang)) xay hoi. hieu ((qua nam) OR (cua nam)) duc va danh ve cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ky dang) or (ky nang)) xay hoi. hieu ((qua nam) OR (cua nam)) duc va danh ve cu tren".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky dang) or (ky nang)) xay hoi. hieu ((qua nam) OR (cua nam)) duc va danh ve cu tren*.