Perhaps you should try some spelling variations:
cuc tieu » muc tieu, cac tieu, cach tieu
hanh tai » thanh tai, hang tai, han tai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nang tai » hang tai, tang tai, sang tai
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
tai hoi » tai khoi, dai hoi, tai hai
ve cac » va cac, vien cac
cuc te » cua te, cuc thue

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) or (sach y)) nang tai hoi. hieu ve cac nuoc va hanh tai ((cuc te) OR (cuc tieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang tai hoi. hieu ve cac nuoc va hanh tai ((cuc te) OR (cuc tieu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) nang tai hoi. hieu ve cac nuoc va hanh tai ((cuc te) OR (cuc tieu))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) nang tai hoi. hieu ve cac nuoc va hanh tai ((cuc te) OR (cuc tieu))*.