Perhaps you should try some spelling variations:
lang duong » lang dong, lang muong, lang tuong
duong tinh » duong minh, duong sinh, dong tinh
hoc thieu » hoc hien
manh cong » manh cuong, hanh cong, manh long
cong chuc » cong thuc, cong cu, cong cua
chuc lang » chuc nang, chuc cong, chi lang
toan cau » 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) or (toc thieu)) sang - manh cong chuc lang duong tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) sang - manh cong chuc lang duong tinh toan cau*.