Perhaps you should try some spelling variations:
quan cau » quang cao, toan cau, quan ha
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
rac tren » ran tren, tac tren, sach tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cau » qua cac, qua ca, qua cai
hanh va » hang va, hanh vi
va rac » va trac, va cac, va dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. hieu ((qua cau) or (quan cau)) truc van hanh va rac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu ((qua cau) OR (quan cau)) truc van hanh va rac tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu ((qua cau) or (quan cau)) truc van hanh va rac tren*.