Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tu sach » thu sach, su sach, te sach
va kinh » va tinh, qua kinh
day cua » dai cua
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
dao cua » dai cua, dan cua, do cua
cau loc » hau loc, cau hoc, cau luc
ve cau » ke cau, va cau, ve cac
loc va » hoc va, luc va

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) or (toc sach)) ky lang xa hoi. hieu ve cau loc va kinh ((dao cua) OR (day cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky lang xa hoi. hieu ve cau loc va kinh ((dao cua) OR (day cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky lang xa hoi. hieu ve cau loc va kinh ((dao cua) OR (day cua)) tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky lang xa hoi. hieu ve cau loc va kinh ((dao cua) OR (day cua)) tu*.