Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
xang ma » tang ma, nang ma, sang ma
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuoc sach)) ty xang ma hoi. hieu qua cac xuc van hanh ((vi cua) OR (vai cua)) su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ty xang ma hoi. hieu qua cac xuc van hanh ((vi cua) OR (vai cua)) su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ty xang ma hoi. hieu qua cac xuc van hanh ((vi cua) OR (vai cua)) su".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ty xang ma hoi. hieu qua cac xuc van hanh ((vi cua) OR (vai cua)) su*.