Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh trung » thanh trung, hanh trang, manh trung
hien lang » tien lang, hien trang, khien bang
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
hach toan » thanh toan, manh toan
tac toan » tap toan, tam toan, tich toan

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 lang) OR (hieu lang)) - hanh trung cua thong cong ((tac toan) or (hach toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien lang) OR (hieu lang)) - hanh trung cua thong cong ((tac toan) OR (hach toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien lang) OR (hieu lang)) - hanh trung cua thong cong ((tac toan) or (hach toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien lang) OR (hieu lang)) - hanh trung cua thong cong ((tac toan) or (hach toan)) cao*.