Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, toc thieu, hoc viet
hanh manh » hanh mang, lanh manh, hoang manh
cua nhung » va nhung
manh cua » doanh cua, ban cua
cong san » cong tac
san toan » van toan, dan toan, manh toan
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 hien) or (((hoc thiet) OR (hoc thuyet)))) hach - hanh manh cua nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (((hoc thiet) OR (hoc thuyet)))) hach - hanh manh cua nhung cong san toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (((hoc thiet) OR (hoc thuyet)))) hach - hanh manh cua nhung cong san toan cao*".