Perhaps you should try some spelling variations:
cham quoc » chuan quoc, han quoc, cham soc
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
cau treo » cau theo, cau tren, cau triet
quoc ban » quoc bao, quoc lan, quoc quan
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
van hoe » van hoa, van hoc, van hieu
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
tu bac » tu ban, tu cac, tu bat

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bac ((ky lang) OR (ky tang)) van hoe. hieu ve cham quoc ban thanh san ((cau treo) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bac ((ky lang) OR (ky tang)) van hoe. hieu ve cham quoc ban thanh san ((cau treo) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bac ((ky lang) OR (ky tang)) van hoe. hieu ve cham quoc ban thanh san ((cau treo) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu bac ((ky lang) OR (ky tang)) van hoe. hieu ve cham quoc ban thanh san ((cau treo) or (su triet))*.