Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
tranh van » tran van, trinh van, thanh van
dung cong » dung trong
theo chu » theo chieu, cho chu, chao chu
tranh va » trang va, trinh va, thanh va
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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

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