Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham sac » cham soc, pham sach, cap sac
hieu su » hieu sau, tieu su, hieu so
hanh de » hanh ve, hanh kem
sac van » cac van, san van, sat van
su cham » su pham, tu cham, vu cham
su sach » so sach, vu sach
xu lang » cu lang, xu dang, xu quang
tu lang » cu lang, tu lanh, tu quang
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

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 ((((tu lang) OR (xu lang))) or (ty xang)) xa hoi. hieu su cham sac van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((tu lang) OR (xu lang))) OR (ty xang)) xa hoi. hieu su cham sac van hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((((tu lang) OR (xu lang))) or (ty xang)) xa hoi. hieu su cham sac van hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((((tu lang) OR (xu lang))) or (ty xang)) xa hoi. hieu su cham sac van hanh de cua tre*.