Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
hanh trinh » canh tranh, hanh chinh
trinh chua » trinh chuan, trinh cua, trinh chu
hoc thieu » toc thieu, hoc hien
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
dan toan » van toan, dan than, manh toan
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 chua ((dong cong) OR (dang cong)) dan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - hanh trinh chua ((dong cong) OR (dang cong)) dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - hanh trinh chua ((dong cong) OR (dang cong)) dan toan ban*.