Perhaps you should try some spelling variations:
hanh cach » hanh cac, hanh sach, tinh cach
van hanh » van thanh, ban hanh, van anh
tang van » dang van, hoang van, trong van
su sach » so sach, vu sach
cach su » cach tu, hoach su
cham lo » cham o, cam lo, cham soc
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
tang ma » mang may
sang ma » nang ma, sang tao, mang may
su tien » su kien, su hien, tu tieng
lo van » le van, vo van, so van

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 ((sang ma) or (((tang ma) or (tang van)))) hoi. lieu va cham lo van hanh cach su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((sang ma) OR (((tang ma) OR (tang van)))) hoi. lieu va cham lo van hanh cach su tien.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((sang ma) or (((tang ma) or (tang van)))) hoi. lieu va cham lo van hanh cach su tien*.