Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tai khoi » tai khoa, tao khoi, tai hoi
mai khoi » mai khoa, tai khoa, cac khoi
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
xa tren » la tren, ca tren, xe tren
ky hang » ky nang, ly hang, ky dang
sach ky » sac ky, sach y, sach ty
luc va » duc va, tuc va, loc va
va cam » va cham, va cao, va cai
va xa » va xac, va xay, va xu

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 hang ((tai khoi) OR (mai khoi)). lieu ((va cam) or (va cac)) luc va hanh va xa tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky hang ((tai khoi) OR (mai khoi)). lieu ((va cam) OR (va cac)) luc va hanh va xa tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky hang ((tai khoi) OR (mai khoi)). lieu ((va cam) or (va cac)) luc va hanh va xa tren*".