Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
qua phan » cua phan, quang phan, luan phan
qua than » qua thanh, qua tan, quan thanh
van hanh » van thanh, ban hanh, van anh
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
luc van » luoc van, luu van, duc van
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: thu sach ky nang x hoi. hieu ((qua phan) OR (qua than)) luc van hanh vi ((va trien) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ((qua phan) OR (qua than)) luc van hanh vi ((va trien) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ((qua phan) OR (qua than)) luc van hanh vi ((va trien) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ((qua phan) OR (qua than)) luc van hanh vi ((va trien) or (su triet))*.