Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, ho chieu, hoc dieu
cua nhung » va nhung
canh dan » canh van, sanh dan, thanh dan
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
dan cua » dan ca, ban cua, dai cua

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) or (hoc hien)) sang - canh dan cua nhung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc hien)) sang - canh dan cua nhung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc hien)) sang - canh dan cua nhung cong tac toan cau*.