Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
va lang » va nang, hoa lang
lang di » lang dai, hang di, lang du
cu tren » tu tren, dua tren
va nam » van nam, ha nam
va nay » va ngay, va cay
di cu » di cau, di cua, di du

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

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