Perhaps you should try some spelling variations:
chua trieu » cua triet, cau trieu, chua thiet
nuoc ban » nuoc san, quoc ban, buoc ban
chua tre » chua tri, cua tre, cho tre
hieu ve » hieu va, hieu van
ban anh » ban hanh, ban banh, ban danh
sac ky » sai ky
ve hoc » te hoc, va hoc, vi hoc
anh va » hanh va

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 ky) or (cac ky)) nang x ho. hieu ve hoc nuoc ban anh va ((chua tre) OR (chua trieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) nang x ho. hieu ve hoc nuoc ban anh va ((chua tre) OR (chua trieu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (cac ky)) nang x ho. hieu ve hoc nuoc ban anh va ((chua tre) OR (chua trieu))".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (cac ky)) nang x ho. hieu ve hoc nuoc ban anh va ((chua tre) OR (chua trieu))*.