Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
su triet » su viet, su tien, ve triet
hanh hai » thanh hai, nhanh hai, hang hai
cham xuc » cam xuc, chat xuc, cham soc
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
va triet » va thiet, va trien, ve triet
cao hoc » co hoc, cho hoc, chat hoc
va hanh » van hanh, va thanh, va danh
sach v » sach va, sach y, sach 2
xuc va » duc va, tuc va, luc va
v nang » va nang, vu nang, van nang

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 v nang ((cau hoi) or (cao hoc)). hieu van cham xuc va hanh hai ((su triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang ((cau hoi) OR (cao hoc)). hieu van cham xuc va hanh hai ((su triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach v nang ((cau hoi) or (cao hoc)). hieu van cham xuc va hanh hai ((su triet) or (va triet))*.