Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
van thach » van thanh, van thac, van hach
thach duc » thach thuc, than duc, thinh duc
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
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: thuoc sach y nang cao hoi. thien van thach duc va hanh ((vi cua) OR (vai cua)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang cao hoi. thien van thach duc va hanh ((vi cua) OR (vai cua)) viet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang cao hoi. thien van thach duc va hanh ((vi cua) OR (vai cua)) viet*.