Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
thien van » thi van
cau nuoc » cap nuoc, cac nuoc, dau nuoc
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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 (thuat lanh)) ky nang x hoi. thien van cau nuoc ((va danh) OR (va dinh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat lanh)) ky nang x hoi. thien van cau nuoc ((va danh) OR (va dinh)) tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat lanh)) ky nang x hoi. thien van cau nuoc ((va danh) OR (va dinh)) tri cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat lanh)) ky nang x hoi. thien van cau nuoc ((va danh) OR (va dinh)) tri cua tre*.