Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
te sach » toc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
vi dau » vi dai, va dau, bi dau

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