Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh nha » thanh nhan, thanh ha, thanh nga
nam thuc » nam thuoc, am thuc, nam thu
da thanh » dao thanh, dat thanh, dam thanh
cam thuc » am thuc, cam thu, can thuc
cua tre » cua te, cuu tre, dua tren
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
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: vu sach ty nang x hoi. hieu ve ((cam thuc) or (nam thuc)) da thanh nha ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang x hoi. hieu ve ((cam thuc) OR (nam thuc)) da thanh nha ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang x hoi. hieu ve ((cam thuc) or (nam thuc)) da thanh nha ((cua tre) OR (cua triet))*".