Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vien cac » vien dai, vien da, gian cac
sach ky » sac ky, sach y, sach ty
xa hang » va hang, xa bang, xa hung
nang ma » tang ma, sang ma, nang cao
thai va » thai van
ma hoi » mai hoi, xa hoi, ma hoa
xuc xa » tuc xa, buc xa
tai va » mai va, tri va, dai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang ma hoi. hieu ((vien cac) or (vien bach)) xuc xa hang ((tai va) OR (thai va)) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ma hoi. hieu ((vien cac) OR (vien bach)) xuc xa hang ((tai va) OR (thai va)) trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ma hoi. hieu ((vien cac) or (vien bach)) xuc xa hang ((tai va) OR (thai va)) trien".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ma hoi. hieu ((vien cac) or (vien bach)) xuc xa hang ((tai va) OR (thai va)) trien*.