Perhaps you should try some spelling variations:
hoc thieu » hoc hien
hinh minh » hinh dinh, hinh kinh, trinh minh
thich anh » thi hanh, hinh anh
hang cong » dang cong, hang nong, bang cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap
va hang » van hang, va nang, va lang

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) sang - ((hinh minh) OR (thich anh)) va hang cong tac toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) OR (toc thieu)) sang - ((hinh minh) or (thich anh)) va hang cong tac toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) OR (toc thieu)) sang - ((hinh minh) or (thich anh)) va hang cong tac toan cao*.