Perhaps you should try some spelling variations:
sach kem » hanh kem
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua
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: thuat ((sach kem) or (sac ky)) nang xa hoi. hieu ve ((cac tuc) OR (cac tac)) va hanh va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach kem) OR (sac ky)) nang xa hoi. hieu ve ((cac tuc) OR (cac tac)) va hanh va cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach kem) or (sac ky)) nang xa hoi. hieu ve ((cac tuc) OR (cac tac)) va hanh va cua tu".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach kem) or (sac ky)) nang xa hoi. hieu ve ((cac tuc) OR (cac tac)) va hanh va cua tu*.