Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, cua thep
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
giao va » gia va, giai va, gian va
ca giao » cua giao, co giao, va giao
hien ca » hien cac, hien cau, hien cua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo

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 ty nang xa hoi. hieu hien ca giao va dinh va ((((cua tre) OR (dua tren))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu hien ca giao va dinh va ((((cua tre) OR (dua tren))) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu hien ca giao va dinh va ((((cua tre) OR (dua tren))) or (cuu tre))*".