Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hanh trinh » canh tranh, hanh chinh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trinh hai » trinh khai, trinh han, trinh tai
san thong » san thuong, sau thong, ban thong
thong dan » thong van, tuong dan, thong den
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
hai san » tai san, hai tan, hai van

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 (theo chieu)) tach - hanh trinh hai san thong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (theo chieu)) tach - hanh trinh hai san thong dan than cao.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (theo chieu)) tach - hanh trinh hai san thong dan than cao*.