Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
van giao » nang giao, toan giao, dan gian
cau tren » cu tren, dau tren, ca tren
cau theo » cau thi, cau tao
sach ky » sach y, sach ty, sach kem
duc gia » quoc gia
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sac ky)) nang x hoi. hieu van giao duc gia thanh hai ((cau tren) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang x hoi. hieu van giao duc gia thanh hai ((cau tren) OR (cau theo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sac ky)) nang x hoi. hieu van giao duc gia thanh hai ((cau tren) or (cau theo))*".