Perhaps you should try some spelling variations:
anh kien » danh kien, hanh kien, anh kiem
tham xuc » tham nuoc, tham thuc, pham duc
tu sach » thu sach, su sach, te sach
va tham » van tham, va cham, va thanh
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
sach vu » sach va, sach tu, sach uu
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
su viet » so viet

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 vu ((nang xa) OR (nang ma)) hoi. hieu va tham xuc van ((hanh ki) or (anh kien)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu ((nang xa) OR (nang ma)) hoi. hieu va tham xuc van ((hanh ki) OR (anh kien)) su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu ((nang xa) OR (nang ma)) hoi. hieu va tham xuc van ((hanh ki) or (anh kien)) su viet".
• Adding a wildcard symbol may retrieve word variants: tu sach vu ((nang xa) OR (nang ma)) hoi. hieu va tham xuc van ((hanh ki) or (anh kien)) su viet*.