Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
hieu cac » hieu luc, hieu van, vien cac
su sach » so sach, vu sach
lam cua » nam cua, lam chat
lap cua » lai cua, tap cua, ap cua
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lo va » lo van, lao va, ly va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x hoi. hieu ((hieu cac) OR (hieu va)) lo va thanh ((lap cua) or (lam cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((hieu cac) OR (hieu va)) lo va thanh ((lap cua) OR (lam cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((hieu cac) OR (hieu va)) lo va thanh ((lap cua) or (lam cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((hieu cac) OR (hieu va)) lo va thanh ((lap cua) or (lam cua)) te*.