Perhaps you should try some spelling variations:
doc sach » hoc sach, nuoc sach, dac sac
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, thuoc sach, nuoc sach
van hang » van khang, van hoang, van thang
nang cho » nang chon, ngang cho, nang cao
hang di » hang doi, hang vi, hang dien
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
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) OR (toc sach)) ky nang cho hoc. ((hieu ve) or (hieu van)) cac xuc van hang di cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) ky nang cho hoc. ((hieu ve) OR (hieu van)) cac xuc van hang di cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (toc sach)) ky nang cho hoc. ((hieu ve) or (hieu van)) cac xuc van hang di cua cau*".