Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. hieu ve ((cam thuc) OR (nam thuc)) va thanh lai ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ve ((cam thuc) OR (nam thuc)) va thanh lai ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu ve ((cam thuc) OR (nam thuc)) va thanh lai ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ve ((cam thuc) OR (nam thuc)) va thanh lai ((cua tre) or (cua viet))*.