Perhaps you should try some spelling variations:
xach tay » canh tay
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
thu va » thuc va, thue va, tu 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: toc ((xach tay) or (sach thu)) lang xa hoi. hieu van nam thu va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((xach tay) OR (sach thu)) lang xa hoi. hieu van nam thu va thanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((xach tay) or (sach thu)) lang xa hoi. hieu van nam thu va thanh va cua tre*.