Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thi nang » ki nang, thi hanh
thi cong » tai cong, thien cong
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cac xuc » cam xuc, chat xuc, cac cuoc
minh di » minh ai, minh de, minh duc
hieu ve » hieu va, hieu van
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: toc sach ((thi nang) OR (thi cong)) cho hoc. hieu ve ((cac xuc) or (cac nuoc)) van minh di cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thi nang) OR (thi cong)) cho hoc. hieu ve ((cac xuc) OR (cac nuoc)) van minh di cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((thi nang) OR (thi cong)) cho hoc. hieu ve ((cac xuc) or (cac nuoc)) van minh di cua cac*".