Perhaps you should try some spelling variations:
cham loc » cham soc, chon loc, cham o
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
sach ky » sach y, sach ty, sach kem
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua

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 ky) OR (sac ky)) nang xa hoi. hieu vu cham loc ((va dinh) or (va dan)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang xa hoi. hieu vu cham loc ((va dinh) OR (va dan)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sac ky)) nang xa hoi. hieu vu cham loc ((va dinh) or (va dan)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sac ky)) nang xa hoi. hieu vu cham loc ((va dinh) or (va dan)) vi cua tre*.