Perhaps you should try some spelling variations:
canh tac » canh tay, canh giac, cong tac
cham luu » cham cuu, chat lua, phap luu
van hanh » van thanh, ban hanh, van anh
dat tren » dat trong, dua tren
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
tac hoi » tao hoi, tay hoi, tac hai
va cham » va chat, va tham
luu van » cuu van, luan van, luu hanh
vi dat » voi dat, vi dai, va dat

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 ky) or (sach ty)) canh tac hoi. lieu va cham luu van hanh vi dat tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) canh tac hoi. lieu va cham luu van hanh vi dat tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) canh tac hoi. lieu va cham luu van hanh vi dat tren*.