Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
nang cho » nang chon, ngang cho, nang cao
van tham » van thanh, van tuan, van chat
thuc dan » thuc hanh, hoc dan, thuc vat
dan danh » van danh, han danh, ban danh
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
cho hoc » co hoc, khoa hoc
thi van » thi lan, thi hanh, thi nang

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