Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
doc sach » hoc sach, toc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
ty ngang » ly ngan, tu ngan, ty xang
thanh di » thanh doi, thanh de, thanh do
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
cua cau » cua cac, cua chu, cua cay
hieu ve » hieu va
cho hoc » co hoc, khoa hoc
te ngan » tu ngan, tai ngan
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ((ty ngang) OR (te ngan)) cho hoc. ((hieu ve) or (hieu van)) cac xuc van thanh di cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((ty ngang) OR (te ngan)) cho hoc. ((hieu ve) OR (hieu van)) cac xuc van thanh di cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((ty ngang) OR (te ngan)) cho hoc. ((hieu ve) or (hieu van)) cac xuc van thanh di cua cau*".