Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, hieu lang
hoc chieu » hoc thieu, ho chieu, hoc hien
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
hanh va » hang va, hanh vi
han va » hang va, nhan va, ban va

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 - hanh ((han va) OR (hanh va)) nhung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sang - hanh ((han va) OR (hanh va)) nhung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - hanh ((han va) OR (hanh va)) nhung cong tac toan cau*.