Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong cong » trong cong, tong cong, thong thong
hoc thiet » hoc thuyet, hoc hien, toc thieu
hoc thieu » toc thieu, hoc hien
trung va » truong va, trang va, trung ha
va thong » va thuong, va phuong, he thong
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, khoan cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) or (hoc thieu)) tach - thanh trung va thong cong tan ((than cau) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thieu)) tach - thanh trung va thong cong tan ((than cau) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (hoc thieu)) tach - thanh trung va thong cong tan ((than cau) or (khan cap))*.