Perhaps you should try some spelling variations:
sach kem » hanh kem
nang cau » nang cao, hang cau, nang dau
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
vai cua » hai cua, lai cua, bai cua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach kem) or (sach y)) nang cau hoi. hieu va cam tuc va hanh ((vai cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sach y)) nang cau hoi. hieu va cam tuc va hanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach kem) or (sach y)) nang cau hoi. hieu va cam tuc va hanh ((vai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach y)) nang cau hoi. hieu va cam tuc va hanh ((vai cua) OR (dai cua)) tre*.