Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
thiet dung » thuyet dung, nhiet dong, viet dung
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
tac than » tac thanh, tam than, bac thanh
tac nhan » tao nhan, cac nhan, tan nhan
dac nhan » cac nhan, danh nhan, ca nhan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu tinh - hanh trinh thiet dung cong ((tac than) or (((tac nhan) OR (dac nhan)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - hanh trinh thiet dung cong ((tac than) OR (((tac nhan) OR (dac nhan)))) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu tinh - hanh trinh thiet dung cong ((tac than) or (((tac nhan) OR (dac nhan)))) cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - hanh trinh thiet dung cong ((tac than) or (((tac nhan) OR (dac nhan)))) cau*.