Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
hanh trinh » canh tranh, hanh chinh
quang tran » quang tuan, quang trung, quang thanh
dong cong » duong cong, dang cong, cong cong
dung cong » dung trong
tran chau » tranh chap, tran huu
hoc dieu » hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc dieu hanh - hanh trinh chuan ((dong cong) or (dung cong)) quang tran chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu hanh - hanh trinh chuan ((dong cong) OR (dung cong)) quang tran chau.
• Adding a wildcard symbol may retrieve word variants: hoc dieu hanh - hanh trinh chuan ((dong cong) or (dung cong)) quang tran chau*.