Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
dinh dat » dinh ket, dinh van, dinh lam
cac phuc » cau phuc, khac phuc, cac thu
tu sach » thu sach, su sach, tu cach
dat cua » dai cua, day cua, mat cua
te sach » toc sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ky tang xa hoi. hieu ve ((cac phuc) OR (cach thuc)) quy dinh dat cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang xa hoi. hieu ve ((cac phuc) OR (cach thuc)) quy dinh dat cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky tang xa hoi. hieu ve ((cac phuc) OR (cach thuc)) quy dinh dat cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang xa hoi. hieu ve ((cac phuc) OR (cach thuc)) quy dinh dat cua te*.