Perhaps you should try some spelling variations:
cham loc » cham soc, chon loc, cham o
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
dang xa » dang xay, lang xa, dang ha
sac ky » cac ky, sai ky
loc va » hoc va, luc va
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: tu ((sach ky) or (sac ky)) dang xa hoi. ((hieu ve) OR (hieu van)) cham loc va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) dang xa hoi. ((hieu ve) OR (hieu van)) cham loc va danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) dang xa hoi. ((hieu ve) OR (hieu van)) cham loc va danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) dang xa hoi. ((hieu ve) OR (hieu van)) cham loc va danh vi cua tre*.