Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
hoc thieu » toc thieu, hoc hien
cong vang » cong lang, cong quang, cong ngang
vang dung » van dung, dang dung, rang dung
trong van » trong cac
toan cau » toan ban, toan tap, toan tai
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 - thanh cong vang dung trong van ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - thanh cong vang dung trong van ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - thanh cong vang dung trong van ((toan cau) or (toan cao))*.