Perhaps you should try some spelling variations:
khoan phap » khoan phai, khoa phau, han phap
phap thong » phap phong, phap chong, pho thong
thu thong » thuy thong, thu thang, thu tuong
khoa thu » khoa than, hoai thu, ho thu
bac khoa » bach khoa, dac khoa, ba khoa
thu lanh » thu canh, thi lanh, thu anh
thu sach » tu sach, thuat sach, thuoc sach
lanh do » lanh dao, lanh co, lanh tho
cam tu » cam thu, nam tu, dam tu
va bac » van bac, va cac, va bai
tam tu » nam tu, dam tu, tam thuc
do va » do van, so va

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 ((tam tu) OR (cam tu)) cac khoan phap thong ) or ( thu lanh do va bac khoa thu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach ((tam tu) OR (cam tu)) cac khoan phap thong ) OR ( thu lanh do va bac khoa thu thong )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu sach ((tam tu) OR (cam tu)) cac khoan phap thong ) or ( thu lanh do va bac khoa thu thong ))".
• Adding a wildcard symbol may retrieve word variants: (( thu sach ((tam tu) OR (cam tu)) cac khoan phap thong ) or ( thu lanh do va bac khoa thu thong ))*.