Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
tieu hanh » dieu hanh, tiem hanh, tien hanh
trong nam » thong nam, trong lam, trong cac
trong tan » trong quan, trong cac, trong ca
trang su » trang suc, trong su, tang su
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu hanh - hanh trang su dung ((trong nam) or (trong tan)) ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu hanh - hanh trang su dung ((trong nam) OR (trong tan)) ((toan tai) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo tieu hanh - hanh trang su dung ((trong nam) or (trong tan)) ((toan tai) or (toan cao))*.