Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
thuc va » thuc vat, thuc dan, thuc day
cuu 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
tuc va » truc va, tuc xa, duc va
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ve cam ((tuc va) OR (thuc va)) hanh vi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ve cam ((tuc va) OR (thuc va)) hanh vi ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve cam ((tuc va) OR (thuc va)) hanh vi ((cua tre) or (cuu tre))*.