Perhaps you should try some spelling variations:
thanh tao » thanh thao, thanh tai, thanh tay
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
cam luu » tam luu
hanh ve » hanh vi, hanh va, hanh kem
luu van » cuu van, luan van, luu hanh
co tren » cu tren, do tren, ca tren
sach ky » sac ky, sach ty, sach kem
tao hoi » tao khoi, tao boi, tay hoi
va cam » va cham, va cac, va cao

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 y)) thanh tao hoi. lieu va cam luu van hanh ve ((cau tren) or (co tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) thanh tao hoi. lieu va cam luu van hanh ve ((cau tren) OR (co tren)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) thanh tao hoi. lieu va cam luu van hanh ve ((cau tren) or (co tren))*.