Perhaps you should try some spelling variations:
thanh nghi » thanh nguoi, thanh ngu, hanh nghe
chuan quoc » han quoc, cua quoc, phan quoc
bac thanh » ban thanh, cac thanh, tai thanh
va trien » va truyen, va thiet, va tuyen
sach thu » sach thue, sach thieu, sach tham
quoc bac » quoc bao, quoc ban, quoc cac
va chuan » va chan, va chua, va huan
hang hai » hoang hai, hang tai, thanh hai
hang mai » hoang mai, hang tai, lang mai
hieu va » lieu va, hieu qua
nghi va » nghi ve, nghiep va, nghiem va
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu ((hang mai) or (hang hai)) hoi. hieu va chuan quoc bac thanh nghi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu ((hang mai) OR (hang hai)) hoi. hieu va chuan quoc bac thanh nghi va trien.
• Adding a wildcard symbol may retrieve word variants: so sach thu ((hang mai) or (hang hai)) hoi. hieu va chuan quoc bac thanh nghi va trien*.