Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
bien cac » vien cac, dien cac, bien ca
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach y) or (sac ky)) nang ma hoi. thieu bien cac nuoc van hanh dai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach y) OR (sac ky)) nang ma hoi. thieu bien cac nuoc van hanh dai ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: te ((sach y) or (sac ky)) nang ma hoi. thieu bien cac nuoc van hanh dai ((cua triet) or (va triet))*.