Perhaps you should try some spelling variations:
dua tren » dung tren
cap nuoc » dat nuoc
nang mai » nang ma, nang tai, lang mai
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
mai hoi » mai khoi, dai hoi, lai hoi
ve cap » ve cac, le cap, ve cai

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

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