Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cac lo » cac lop, cac co, cac bo
cua te » cua tu
cua su » qua su

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 lang xa hoi. hieu hien cac lo ((va hanh) OR (va thanh)) vai ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu hien cac lo ((va hanh) OR (va thanh)) vai ((cua te) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu hien cac lo ((va hanh) OR (va thanh)) vai ((cua te) or (cua su))".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu hien cac lo ((va hanh) OR (va thanh)) vai ((cua te) or (cua su))*.