Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, nhung don
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
toan tai » toan tap, doanh tai, toan cao
toan ban » van 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 tinh - hanh trinh quan ((nhung cong) OR (hang cong)) dan ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - hanh trinh quan ((nhung cong) OR (hang cong)) dan ((toan tai) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - hanh trinh quan ((nhung cong) OR (hang cong)) dan ((toan tai) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - hanh trinh quan ((nhung cong) OR (hang cong)) dan ((toan tai) or (toan ban))*.