Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach kem » hanh kem
cao hoi » cau hoi, co hoi, cao hoc
sach ky » sac ky, sach ty, sach hay
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca cau
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau

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 ky) or (sach kem))) or (sach y)) nang cao hoi. hieu va cam tuc va dan can cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ky) OR (sach kem))) OR (sach y)) nang cao hoi. hieu va cam tuc va dan can cau tren.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ky) or (sach kem))) or (sach y)) nang cao hoi. hieu va cam tuc va dan can cau tren*.