Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
qua cac » cua cac
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
van anh » van thanh, tuan anh, van minh
cua tuc » cua duc, cua tu, cua thuoc
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: thu sach y ((lang van) or (dang van)) hoa. hieu qua cac luc ((va hanh) or (van anh)) vi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((lang van) OR (dang van)) hoa. hieu qua cac luc ((va hanh) OR (van anh)) vi cua tuc.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((lang van) or (dang van)) hoa. hieu qua cac luc ((va hanh) or (van anh)) vi cua tuc*.