Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
hanh trinh » canh tranh, hanh chinh
hoc thiet » hoc thieu, hoc hien, toc thieu
trinh xay » trinh ky
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
phan lap » phan dau

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 thuyet)) danh - hanh trinh xay dung ((cong van) or (song van)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thuyet)) danh - hanh trinh xay dung ((cong van) OR (song van)) phan lap.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (hoc thuyet)) danh - hanh trinh xay dung ((cong van) or (song van)) phan lap*.