Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
trinh cua » tinh cua, trinh luat, trinh quan
nhung don » nhung van, nhung bo
toan cau » 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: hoc ((chieu sang) or (thieu khang)) - hanh trinh cua ((nhung don) or (thong cong)) tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (thieu khang)) - hanh trinh cua ((nhung don) OR (thong cong)) tinh toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (thieu khang)) - hanh trinh cua ((nhung don) or (thong cong)) tinh toan cau*.