Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham cuu » cap cuu, chat cua
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
dan sai » danh sai, doan sai, dan tai
co hoi » co hoc, co loi
va dan » ca dan, va dao, va dau
sai va » mai va, dai va, hai va
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang ((o hoi) or (co hoi)). lieu va ((cham soc) or (cham cuu)) va dan sai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((o hoi) OR (co hoi)). lieu va ((cham soc) OR (cham cuu)) va dan sai va triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((o hoi) or (co hoi)). lieu va ((cham soc) or (cham cuu)) va dan sai va triet*.