Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
cua van » cua ban, cua vat, cua dan
du chat » duoc chat, dung chat, doc chat
tu sach » thu sach, su sach, te sach
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
vu cham » va cham, vu kham, tu cham
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) ty hang xa hoi. hieu ((vu cham) or (du chat)) cua van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ty hang xa hoi. hieu ((vu cham) OR (du chat)) cua van hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ty hang xa hoi. hieu ((vu cham) or (du chat)) cua van hanh vi su triet*.