Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ky tang » ky dang, kho tang, ky trong
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va hang » van hang, va nang, va lang
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
di va » dai va, doi va, di vat

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 tang) or (ky nang)) xa hoi. hieu ve cac tuc va hang ((di va) OR (di vao)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (ky nang)) xa hoi. hieu ve cac tuc va hang ((di va) OR (di vao)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky tang) or (ky nang)) xa hoi. hieu ve cac tuc va hang ((di va) OR (di vao)) triet*".