Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
danh vi » hanh vi, dinh vi, danh di
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
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 ty ((lang xa) or (nang cao)) hoi. hieu qua cham ((xuc va) OR (luc va)) danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((lang xa) OR (nang cao)) hoi. hieu qua cham ((xuc va) OR (luc va)) danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty ((lang xa) or (nang cao)) hoi. hieu qua cham ((xuc va) OR (luc va)) danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((lang xa) or (nang cao)) hoi. hieu qua cham ((xuc va) OR (luc va)) danh vi cua tre*.