Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, lieu tinh
thien tinh » khien tinh, thien minh, tien tinh
dung cong » dung trong
tinh cua » trinh cua, sinh cua, tranh cua
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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) or (thien tinh)) - hanh ((tinh cua) or (tinh chat)) dung cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tinh) OR (thien tinh)) - hanh ((tinh cua) OR (tinh chat)) dung cong van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tinh) or (thien tinh)) - hanh ((tinh cua) or (tinh chat)) dung cong van toan cao*.