Perhaps you should try some spelling variations:
hoc chiet » hoc thiet, hoc hien, hoc viet
hoc nhiet » hoc thiet, hoc nghien, hoc hien
hanh manh » hanh mang, lanh manh, hoang manh
dang cong » dung cong
trinh can » trinh han, trinh san, trinh cau
manh cua » doanh cua, ban cua
cua dang » cua cong, cua ban
can ban » van ban, toan 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 chiet) OR (hoc nhiet)) tach - hanh manh cua dang cong trinh can ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) OR (hoc nhiet)) tach - hanh manh cua dang cong trinh can ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) OR (hoc nhiet)) tach - hanh manh cua dang cong trinh can ban*.