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