Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
thuc day » thuc dan, thuc vat
hanh va » hang va, hanh vi
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
xuc va » duc va, tuc va, luc va
sac ky » cac ky, sai ky
va dau » va dao
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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: te ((sach ky) OR (sac ky)) nang x hoi. hieu ve cam ((xuc va) OR (thuc day)) hanh va dau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang x hoi. hieu ve cam ((xuc va) or (thuc day)) hanh va dau tren~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang x hoi. hieu ve cam ((xuc va) or (thuc day)) hanh va dau tren*.