Perhaps you should try some spelling variations:
sach va » sach xa, sach ha, sach dao
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
sach v » sach y, sach 2, sach vay
va cam » va cham, va cac, va cao
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach v) or (sach va)) lang xa hoi. hieu va cam duc va hanh ((di cua) OR (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach v) OR (sach va)) lang xa hoi. hieu va cam duc va hanh ((di cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach v) or (sach va)) lang xa hoi. hieu va cam duc va hanh ((di cua) OR (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: toc ((sach v) or (sach va)) lang xa hoi. hieu va cam duc va hanh ((di cua) OR (dai cua)) triet*.