Perhaps you should try some spelling variations:
than duc » tran duc, phan duc, than doc
hieu van » hieu va, thien van, lieu va
tham duc » pham duc, tham du, thach duc
te sach » toc sach
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
nang co » nang cao, nang doc, nang noi
ty nang » ky nang, ty xang, ty hang
co hoi » co hoc, co loi

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