Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thieu » hoc hien
trang va » hang va
tran van » luan van
cong van » cong vang, cong san, song van
van tuan » van quan, van ban, anh tuan
tuan cau » toan cau, quan cau, tuan cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (toc thieu)) sach - hanh ((trang va) OR (tran van)) nhung cong van tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) sach - hanh ((trang va) OR (tran van)) nhung cong van tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (toc thieu)) sach - hanh ((trang va) OR (tran van)) nhung cong van tuan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) sach - hanh ((trang va) OR (tran van)) nhung cong van tuan cau*.