Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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: su sach thu nang xa hoi. hieu ve cac ((xuc va) or (tuc va)) hanh vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang xa hoi. hieu ve cac ((xuc va) OR (tuc va)) hanh vai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang xa hoi. hieu ve cac ((xuc va) or (tuc va)) hanh vai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach thu nang xa hoi. hieu ve cac ((xuc va) or (tuc va)) hanh vai ((cua tre) OR (cuu tre))*.