Perhaps you should try some spelling variations:
thien van » thi van
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
hai xuc » hai cuc, hai xu, chat xuc
van hai » van ha, van chat, van hanh
cao hoi » cau hoi, co hoi, cao hoc
bo sach » co sach, hoc sach
xuc va » duc va, tuc va, luc va
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: ((tu sach) or (bo sach)) ky nang cao hoi. thien van hai xuc va danh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (bo sach)) ky nang cao hoi. thien van hai xuc va danh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (bo sach)) ky nang cao hoi. thien van hai xuc va danh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (bo sach)) ky nang cao hoi. thien van hai xuc va danh ((vi cua) OR (vai cua)) tre*.