Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
ban hang » ngan hang
cua tuc » cua duc, cua tu, luat tuc
hang vi » hang va, hanh vi, hang di
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
vu sach » vu bach, su sach, vu khach
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
qua cam » qua cham, qua cac, qua ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sach)) ty nang cao hoi. hieu qua cam duc ban hang vi ((cua tuc) OR (cua thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) ty nang cao hoi. hieu qua cam duc ban hang vi ((cua tuc) OR (cua thuoc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sach)) ty nang cao hoi. hieu qua cam duc ban hang vi ((cua tuc) OR (cua thuoc))".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) ty nang cao hoi. hieu qua cam duc ban hang vi ((cua tuc) OR (cua thuoc))*.