Perhaps you should try some spelling variations:
cham luu » cham cuu, chat lua, phap luu
van hanh » van thanh, ban hanh, van ban
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
hang xa » hoang xa, hang va, hang ca
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
van anh » van thanh, tuan anh, van minh
y hang » ly hang, ty hang, yu hang
ki su » ky 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 y hang xa hoi. hieu vu cham luu ((van hanh) or (van anh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y hang xa hoi. hieu vu cham luu ((van hanh) OR (van anh)) ki su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y hang xa hoi. hieu vu cham luu ((van hanh) or (van anh)) ki su triet*.