Perhaps you should try some spelling variations:
te sach » toc sach
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
nang ma » tang ma, sang ma, nang cao
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
vi luy » vi luu
vi lua » vi luu

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 x) OR (nang ma)) hoi. hieu ve cac xuc va dinh ((vi luy) OR (vi lua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang x) or (nang ma)) hoi. hieu ve cac xuc va dinh ((vi luy) OR (vi lua)) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang x) or (nang ma)) hoi. hieu ve cac xuc va dinh ((vi luy) OR (vi lua)) tre*.