Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
nang cho » nang chon, ngang cho, nang cao
van hanh » van thanh, ban hanh, van anh
cua cau » cua cac, cua chu, cua can
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu van
cho hoc » co hoc, khoa hoc
cua cay » cua cac

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

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