Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ky) OR (sac ky)) lang xa hoi. ((hieu ve) or (hieu van)) cac luc va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sac ky)) lang xa hoi. ((hieu ve) OR (hieu van)) cac luc va thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) OR (sac ky)) lang xa hoi. ((hieu ve) or (hieu van)) cac luc va thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) OR (sac ky)) lang xa hoi. ((hieu ve) or (hieu van)) cac luc va thanh va cua tre*.