Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
thanh lap » thanh san, phan lap, thanh hai
trinh va » trinh van, trinh vat, trinh ve
phan dau » phan tu, hang dau

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 tinh - hanh trinh va ((dang cong) OR (dung cong)) dan ((phan dau) or (thanh lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - hanh trinh va ((dang cong) OR (dung cong)) dan ((phan dau) OR (thanh lap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - hanh trinh va ((dang cong) OR (dung cong)) dan ((phan dau) or (thanh lap))*".