Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
sach thu » sach thue, sach thieu, sach tham
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
cua tuc » cua duc, cua tu, luat tuc
cac luc » cau luc, coc luc, cac nuoc
sach ty » sach y, sach tu, xach tay
hang xa » hoang xa, hang va, hang ca
van cac » van hac, van cau, van bac
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach thu)) hang xa hoi. hieu van cac luc va hanh vai ((cua tuc) OR (cua thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) hang xa hoi. hieu van cac luc va hanh vai ((cua tuc) OR (cua thuoc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach thu)) hang xa hoi. hieu van cac luc va hanh vai ((cua tuc) OR (cua thuoc))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) hang xa hoi. hieu van cac luc va hanh vai ((cua tuc) OR (cua thuoc))*.