Perhaps you should try some spelling variations:
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
su sach » so sach
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

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