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

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