Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
va kinh » va tinh, qua kinh
va dinh » van dinh, va tinh, vu dinh
sach ky » sac ky, sach ty, sach kem
cac lao » ca lao, cac loai, cac giao
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
va cua » va chua, via cua, ca cua

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) OR (sach y)) nang xa hoi. hieu hien cac lao ((va dinh) or (va kinh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang xa hoi. hieu hien cac lao ((va dinh) OR (va kinh)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang xa hoi. hieu hien cac lao ((va dinh) or (va kinh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) nang xa hoi. hieu hien cac lao ((va dinh) or (va kinh)) va cua tre*.