Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
ban hanh » ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, van anh, van ban
nang cho » nang chon, ngang cho, nang cao
cac vuc » cac nuoc, cac vung, cac cuoc
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
tu nang » tru nang, tu nong, tu nano
cua cay » cua cac
ve cac » va cac, vien cac
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 (hoc sach)) tu nang cho hoc. hieu ve cac vuc ((van hanh) or (ban hanh)) vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) tu nang cho hoc. hieu ve cac vuc ((van hanh) OR (ban hanh)) vi cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) tu nang cho hoc. hieu ve cac vuc ((van hanh) or (ban hanh)) vi cua cay*".