Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
nam thuoc » nam thuc, nam thu, nha thuoc
nuoc sach » nguoi sach, cuoc cach, cuon sach
thuoc va » thuc va, thuoc ma, thuong va
hoc sach » hoc sinh, hoc cac, hoc anh
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (nuoc sach)) ((ky lang) OR (ky nang)) xa hoi. hieu va nam thuoc va dan va cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (nuoc sach)) ((ky lang) OR (ky nang)) xa hoi. hieu va nam thuoc va dan va cau triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (nuoc sach)) ((ky lang) OR (ky nang)) xa hoi. hieu va nam thuoc va dan va cau triet*".