Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
nam thuy » nam thuc, nam thue, nam thuoc
khoa hoi » khoan hoi, khoa hoc, khoa doi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu le » hieu ve, hieu he, hieu ly
hoa hoi » hoa hoc, hoa doi, hoc hoi
ky lang » ky nang, ky dang, ky tang
vai su » va su, van su, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang ((hoa hoi) or (khoa hoi)). hieu le ((nam thuy) OR (nam thu)) van thanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang ((hoa hoi) OR (khoa hoi)). hieu le ((nam thuy) OR (nam thu)) van thanh vai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ((hoa hoi) or (khoa hoi)). hieu le ((nam thuy) OR (nam thu)) van thanh vai su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ((hoa hoi) or (khoa hoi)). hieu le ((nam thuy) OR (nam thu)) van thanh vai su triet*.