Perhaps you should try some spelling variations:
sach kem » hanh kem
van hanh » van thanh, ban hanh, van anh
tue muu » thue mua
tue cuu » tue cua, tu cuu
xuc van » duc van, luc van, vuc van
nam xuc » cam xuc, nam xua, nam thuc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va nam » van nam, ha nam, va nay
sai ky » sac ky

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 kem) or (sai ky)) nang xa hoi. hieu va nam xuc van hanh ((tue cuu) OR (tue muu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sai ky)) nang xa hoi. hieu va nam xuc van hanh ((tue cuu) OR (tue muu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach kem) or (sai ky)) nang xa hoi. hieu va nam xuc van hanh ((tue cuu) OR (tue muu)) tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sai ky)) nang xa hoi. hieu va nam xuc van hanh ((tue cuu) OR (tue muu)) tre*.