Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
van tham » van thanh, van tuan, van chat
nang cho » nang chon, ngang cho, nang cao
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cho hoc » co hoc, khoa hoc
thi van » thi lan, thi hanh, thi nang
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh

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 ky nang cho hoc. thi van tham thuc ((va danh) OR (va dinh)) ((dai cua) or (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cho hoc. thi van tham thuc ((va danh) OR (va dinh)) ((dai cua) OR (lai chau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cho hoc. thi van tham thuc ((va danh) OR (va dinh)) ((dai cua) or (lai chau)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cho hoc. thi van tham thuc ((va danh) OR (va dinh)) ((dai cua) or (lai chau)) tre*.