Perhaps you should try some spelling variations:
dua tren » dung tren
tu sach » thu sach, su sach, te sach
xa hanh » xa thanh, xa khanh, va hanh
sach va » sach xa, sach ha, sach dao
hieu va » lieu va, hieu qua
va nang » van nang, da nang, cam nang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao
xuc xa » tuc xa, buc xa

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