Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tinh da » tinh va, tinh gia, tinh lao
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ty lang » tay lang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, duc va
da cua » dai cua, day cua, dan 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 ty lang xa hoi. ((hieu ve) or (hieu qua)) cau ((tuc va) or (tuc xa)) tinh da cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang xa hoi. ((hieu ve) OR (hieu qua)) cau ((tuc va) OR (tuc xa)) tinh da cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. ((hieu ve) or (hieu qua)) cau ((tuc va) or (tuc xa)) tinh da cua tre*.