Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hanh trinh » canh tranh, hanh chinh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thiet anh » thien anh, thuyet anh, thien danh
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
thanh cac » hanh cac, thanh bac, thanh ca
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet anh - hanh trinh vat ((nhung cong) or (dung cong)) dan ((than cau) or (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet anh - hanh trinh vat ((nhung cong) OR (dung cong)) dan ((than cau) OR (thanh cac)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet anh - hanh trinh vat ((nhung cong) or (dung cong)) dan ((than cau) or (thanh cac))*.