Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu
thanh va » thanh van, hanh va, thanh ha
de thanh » le thanh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
nam tu » nam thu
va cuu » va cau, va chu, va huu

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) OR (nam tu))) or (am thuc)) de thanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ve ((((nam thuc) OR (nam tu))) OR (am thuc)) de thanh va cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu ve ((((nam thuc) OR (nam tu))) or (am thuc)) de thanh va cuu tre*".