Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, dua tren
va nam » van nam, ha nam, va nay
va dau » va dao
va dan » ca dan, va dao, va dap

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu va nam thuc ((va dan) or (va dau)) vai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu va nam thuc ((va dan) OR (va dau)) vai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu va nam thuc ((va dan) or (va dau)) vai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu va nam thuc ((va dan) or (va dau)) vai ((cua tre) OR (cua triet))*.