Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van hanh » van thanh, ban hanh, van anh
va thanh » gia thanh, ban thanh, le thanh
hien cac » thien cac, vien cac, hieu cac
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cac ly » cac ky, cac le, cam ly
cua tu » cua tuc, cua su, cua cu

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

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