Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
nmanh tinh » nhanh tinh, thanh tinh, man tinh
hoc thieu » toc thieu, hoc hien
manh tinh » man tinh, manh binh, canh tinh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
tac toan » tap toan, tam toan, hach toan
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 tinh - ((manh tinh) or (nmanh tinh)) va ((hang cong) or (dang cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - ((manh tinh) OR (nmanh tinh)) va ((hang cong) OR (dang cong)) tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - ((manh tinh) or (nmanh tinh)) va ((hang cong) or (dang cong)) tac toan cau*.