Perhaps you should try some spelling variations:
thien dang » thien bang, thien danh, thien nang
nhung cong » dung cong, thong cong, nhung don
hoc thien » hoc hien, hoc thieu, hoc thiet
hang cong » dang cong, hang nong, bang cong
trinh va » trinh van, trinh vat, trinh ve
trang va » tran van, hang va
van tan » van tuan, van ban, van tai
tan cau » toan cau, van cau, tan ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien dang - hanh ((trinh va) or (trang va)) ((nhung cong) or (hang cong)) van tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien dang - hanh ((trinh va) OR (trang va)) ((nhung cong) OR (hang cong)) van tan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien dang - hanh ((trinh va) or (trang va)) ((nhung cong) or (hang cong)) van tan cau*.