Perhaps you should try some spelling variations:
hieu van » thien van, lieu va
nano cho » nang cho, nano cuo, nang chon
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
te cach » ve cach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
cua cau » cua cac, cua chu, cua cay
hieu va » lieu va, hieu qua
cach tu » cach thuc
cho hoc » co hoc, khoa hoc
tu nano » truc nano

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cach tu nano cho hoc. ((((hieu ve) or (hieu van))) or (hieu va)) cac nuoc van hanh tai cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach tu nano cho hoc. ((((hieu ve) OR (hieu van))) OR (hieu va)) cac nuoc van hanh tai cua cau*.