Perhaps you should try some spelling variations:
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
giau cua » gian cua, gia cua, dieu cua
cham duc » pham duc, cham soc, pham duy
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tang xa » trang xa, tang ma, lang xa
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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 thu) OR (sach tham)) tang xa hoi. hieu vu cham duc ((va hanh) or (va dan)) giau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach tham)) tang xa hoi. hieu vu cham duc ((va hanh) OR (va dan)) giau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach tham)) tang xa hoi. hieu vu cham duc ((va hanh) or (va dan)) giau cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach tham)) tang xa hoi. hieu vu cham duc ((va hanh) or (va dan)) giau cua tre*.