Perhaps you should try some spelling variations:
vat cua » mat cua, bat cua, dat cua
van vat » van chat, nhan vat
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
tac va » tac da, tuc va, tac ha
tac xa » tuc xa, tac da

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 y)) lang xa hoi. hieu va cac ((tac va) OR (tac xa)) van vat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) lang xa hoi. hieu va cac ((tac va) OR (tac xa)) van vat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) lang xa hoi. hieu va cac ((tac va) OR (tac xa)) van vat cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) lang xa hoi. hieu va cac ((tac va) OR (tac xa)) van vat cua tre*.