Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
vai cua » dai cua, hai cua, lai cua
xuc van » duc van, luc van, vuc van
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
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: ((toc sach) or (thuoc sach)) ty nang ma hoi. hieu va chat xuc van hanh ((vi cua) OR (vai cua)) cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ty nang ma hoi. hieu va chat xuc van hanh ((vi cua) OR (vai cua)) cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (thuoc sach)) ty nang ma hoi. hieu va chat xuc van hanh ((vi cua) OR (vai cua)) cu".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) ty nang ma hoi. hieu va chat xuc van hanh ((vi cua) OR (vai cua)) cu*.