Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
quan pham » tuan pham, quan phap, quang phat
van thanh » van tuan
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
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: su sach ky nang x hoi. hieu quan pham duc ((van thanh) OR (ban thanh)) hoa ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu quan pham duc ((van thanh) OR (ban thanh)) hoa ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu quan pham duc ((van thanh) OR (ban thanh)) hoa ((cua tre) or (cua te))*".