Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
hoc lieu » hoc dieu, hoc sieu, hoc tieu
van hanh » van thanh, ban hanh, van anh
hanh cua » manh cua, hang cua, hanh sua
san toan » van toan, dan toan, 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 lieu) or (hoc thieu)) tinh - van hanh cua ((dung cong) or (thong cong)) san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc lieu) OR (hoc thieu)) tinh - van hanh cua ((dung cong) OR (thong cong)) san toan ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc lieu) or (hoc thieu)) tinh - van hanh cua ((dung cong) or (thong cong)) san toan ban*.