Perhaps you should try some spelling variations:
trinh toant » tinh toan, trinh thanh, trinh hoan
trinh toan » tinh toan, thanh toan, trinh han
nang cong » nang song, dang cong, bang cong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
hoc dieu » hoc thieu, hoc hien
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 dieu hanh - hanh ((trinh toan) or (trinh toant)) nang cong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu hanh - hanh ((trinh toan) OR (trinh toant)) nang cong manh toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc dieu hanh - hanh ((trinh toan) or (trinh toant)) nang cong manh toan ban*.