Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu khang - canh trinh va nhung cong san ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu khang - canh trinh va nhung cong san ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu khang - canh trinh va nhung cong san ((toan cau) or (toan tap))*.