Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
sach ky » sach y, sach ty, sach kem
dat cuu » dat cau, dat cua
dan dat » dung dat, dong dat, dinh dat
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, ma hoa, me hoi
sac ky » cac ky, sai ky
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: te ((sach ky) OR (sac ky)) nang ((ma hoi) or (xa hoi)). hieu vu cham tuc va dan dat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang ((ma hoi) OR (xa hoi)). hieu vu cham tuc va dan dat cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang ((ma hoi) or (xa hoi)). hieu vu cham tuc va dan dat cuu tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang ((ma hoi) or (xa hoi)). hieu vu cham tuc va dan dat cuu tre*.