Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
hanh han » hanh nhan, hanh phan, anh han
hanh san » thanh san, khach san, thanh son
cong dan » cong san, cong tan, huong dan
nhan tai » hang tai, van tai, 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 sang - ((hanh han) or (hanh san)) he thong cong dan ((nhan tai) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((hanh han) OR (hanh san)) he thong cong dan ((nhan tai) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((hanh han) or (hanh san)) he thong cong dan ((nhan tai) or (toan tap))*.