Perhaps you should try some spelling variations:
thien van » thi van
than duc » tran duc, phan duc, than doc
ban hanh » ban hang
tham duc » pham duc, tham du, thach duc
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, va hanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
cua tre » cua te, cuu tre, cua triet

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 ky nang cao hoi. thien van ((tham duc) OR (than duc)) ((ban hanh) or (va danh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang cao hoi. thien van ((tham duc) OR (than duc)) ((ban hanh) OR (va danh)) lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang cao hoi. thien van ((tham duc) OR (than duc)) ((ban hanh) or (va danh)) lai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang cao hoi. thien van ((tham duc) OR (than duc)) ((ban hanh) or (va danh)) lai cua tre*.