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