Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
ky sang » ky dang, ky tang, duy sang
hieu tu » chieu tu, hieu tuc, hien tu
tu cham » toc cham, thi cham
soc van » hoc van, oc van, sac van
tai cua » thai cua, tai cuc, tri cua
tu sac » tu cac, tu san, tu bac
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu sach)) ((ky sang) or (ky nang)) dai hoc. hieu tu cham soc van hanh tai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ((ky sang) OR (ky nang)) dai hoc. hieu tu cham soc van hanh tai cua su.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu sach)) ((ky sang) or (ky nang)) dai hoc. hieu tu cham soc van hanh tai cua su*.