Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
trung tran » trung tuan, trung thanh, trung tam
tran nhung » tranh nhung, tran hung, tren nhung
nhung cong » dung cong, thong cong, hang cong
hoc thieu » hoc hien
cong tap » cuong tap, cong tac, cong tan
quan cau » quang cao, quan ha, quan cua
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: ((hoc thieu) or (toc thieu)) sach - hanh trung tran nhung cong tap ((quan cau) OR (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) sach - hanh trung tran nhung cong tap ((quan cau) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (toc thieu)) sach - hanh trung tran nhung cong tap ((quan cau) OR (toan cau))".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) sach - hanh trung tran nhung cong tap ((quan cau) OR (toan cau))*.