Perhaps you should try some spelling variations:
tdinh trong » trinh trong, chinh trong, sinh trong
thieu sang » chieu sang, thieu khang, thieu quang
dinh trong » sinh trong, chinh trong, dinh thuong
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
phan dau » phan tu, hang dau
phan cac » nhan cach, phan lap, phan van
tu dung » tuc dung, tu duong, su dung

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 sang - ((tdinh trong) or (dinh trong)) tu dung cong tan ((phan dau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((tdinh trong) OR (dinh trong)) tu dung cong tan ((phan dau) OR (phan cac)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((tdinh trong) or (dinh trong)) tu dung cong tan ((phan dau) or (phan cac))*.