Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
nang cho » nang chon, ngang cho, nang cao
van hanh » ban hanh, van anh, van ban
cho hoc » co hoc, khoa hoc
cua cau » cua chu, cua cay, cua can
va coc » va cuoc, va cac, va hoc

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 thu nang cho hoc. lieu va coc luc ((van hanh) OR (van thanh)) vi ((cua cau) or (cua cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thu nang cho hoc. lieu va coc luc ((van hanh) OR (van thanh)) vi ((cua cau) OR (cua cac))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thu nang cho hoc. lieu va coc luc ((van hanh) OR (van thanh)) vi ((cua cau) or (cua cac))*".