Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
sach ky » sac ky, sach ty, sach kem
hanh ve » hanh vi, hanh va, hanh kem
xa hanh » xa thanh, xa khanh, va hanh
cam tuc » cam xuc, cam tu, nam thuc
cu tren » tu tren, dua tren
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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

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