Perhaps you should try some spelling variations:
hien cac » thien cac, hieu cac, dien cac
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lap cua » lai cua, tap cua, ap cua
lam cua » nam cua, lam chat
lo gia » ho gia, co gia, do gia
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 ((hien cac) OR (vien cac)) lo gia 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 ((hien cac) OR (vien cac)) lo gia 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 ((hien cac) OR (vien cac)) lo gia thanh ((lap cua) or (lam cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((hien cac) OR (vien cac)) lo gia thanh ((lap cua) or (lam cua)) te*.