Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
khanh ve » hanh ve, thanh ve, khanh v
xa khanh » xa thanh, van khanh, dat khanh
sach ky » sac ky, sach y, sach kem
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
va cam » va cham, va cac, va cao
ve cau » ke cau, va cau, ve cac
x hoi » o hoi, x ho, 5 hoi

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