Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
nang cho » nang chon, ngang cho, nang cao
van anh » van thanh, tuan anh, van minh
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
cua cay » cua cac
y nang » ky nang, ly nang, v nang
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di 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 sach) OR (doc sach)) y nang cho hoc. hieu ve ((coc luc) or (hoc nuoc)) van anh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) y nang cho hoc. hieu ve ((coc luc) OR (hoc nuoc)) van anh vi cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y nang cho hoc. hieu ve ((coc luc) or (hoc nuoc)) van anh vi cua cay*".