Perhaps you should try some spelling variations:
doanh qua » doanh quan, doanh cua, danh qua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
qua cua » quan cua, quang cua, qua quan
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
xuc va » duc va, luc va, xac va
tuc va » truc va, tuc xa, duc va
ve cac » va cac, vien cac

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