Perhaps you should try some spelling variations:
sach kem » hanh kem
cham tuc » nham thuc, pham thuc, tham thuc
cau tren » cu tren, dau tren, ca tren
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
tuc va » thuc va, truc va, tuc xa
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach kem) or (sach y)) nang co hoc. hieu ve cham tuc va hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach kem) OR (sach y)) nang co hoc. hieu ve cham tuc va hanh ve cau tren.
• Adding a wildcard symbol may retrieve word variants: thu ((sach kem) or (sach y)) nang co hoc. hieu ve cham tuc va hanh ve cau tren*.