Perhaps you should try some spelling variations:
khoan phap » khoan phai, khoa phau, han phap
phap chong » phap phong, phap cong, pham hong
phu thong » pho thong, phap thong, khau thong
lao khoan » lao khoa, tao khoang, cac khoan
sach tri » sach tai, sach tren, sach truc
khoa phu » khoa phau, khoa thu, hoa phu
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
te lao » tue lao, te cao, te dao
du lao » duc lao, du bao, cu lao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach tri ((te lao) OR (te bao)) khoa phu thong ) or ( thu sach tri du lao khoan phap chong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tri ((te lao) OR (te bao)) khoa phu thong ) OR ( thu sach tri du lao khoan phap chong )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach tri ((te lao) OR (te bao)) khoa phu thong ) or ( thu sach tri du lao khoan phap chong ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach tri ((te lao) OR (te bao)) khoa phu thong ) or ( thu sach tri du lao khoan phap chong ))*.