Perhaps you should try some spelling variations:
sach kem » hanh kem
thanh di » thanh doi, thanh de, thanh do
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach kem) OR (sac ky)) nang xa hoi. hieu va cam ((xuc van) OR (vuc van)) thanh di cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach kem) or (sac ky)) nang xa hoi. hieu va cam ((xuc van) OR (vuc van)) thanh di cua vat~".
• Adding a wildcard symbol may retrieve word variants: te ((sach kem) or (sac ky)) nang xa hoi. hieu va cam ((xuc van) OR (vuc van)) thanh di cua vat*.