Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
va triet » va thiet, va trien, ve triet
qua cac » cua cac
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
xuc va » tuc va, luc va, xac va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach van nang x hoi. hieu qua cac ((xuc va) or (duc va)) ((hanh di) or (hang di)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach van nang x hoi. hieu qua cac ((xuc va) OR (duc va)) ((hanh di) OR (hang di)) va triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach van nang x hoi. hieu qua cac ((xuc va) or (duc va)) ((hanh di) or (hang di)) va triet*.