Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hanh vai » hanh vi, hanh tai, hanh van
tai lang » tai cong, tai san, va lang
thuoc va » thuc va, thuoc ma, thuong va
su sach » so sach, vu sach
hanh va » hang va, hanh vi
thi lan » thi hanh, thi nang, thi lien
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam

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 ((tai lang) OR (thi lan)) xa hoi. hieu ve nam thuoc va ((hanh vai) or (hanh va)) hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tai lang) OR (thi lan)) xa hoi. hieu ve nam thuoc va ((hanh vai) OR (hanh va)) hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tai lang) OR (thi lan)) xa hoi. hieu ve nam thuoc va ((hanh vai) or (hanh va)) hoa viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((tai lang) OR (thi lan)) xa hoi. hieu ve nam thuoc va ((hanh vai) or (hanh va)) hoa viet*.