Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
theo chieu » theo tieu, ho chieu, theo chu
hanh hanh » hanh han, xanh hanh, nhanh thanh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
vat phan » va phan, van phan, sat phan
phan cau » phan dau, phan cac, phan tu
hanh va » hang va, hanh vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doc hieu)) xanh - hanh hanh va ((nhung cong) or (dung cong)) vat phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doc hieu)) xanh - hanh hanh va ((nhung cong) OR (dung cong)) vat phan cau.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doc hieu)) xanh - hanh hanh va ((nhung cong) or (dung cong)) vat phan cau*.