Perhaps you should try some spelling variations:
hang thanh » hoang thanh, thang thanh, dang thanh
thu hang » thi hang, thuc hanh, thu huong
thanh va » thanh van, hanh va, thanh ha
vu kham » vu khanh
tu sach » thu sach, su sach, te sach
nang co » nang cao, nang doc, nang noi
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu kham) or (tu sach)) ky ((nang x) or (nang co)) hoi. lieu va nam thu hang thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu kham) OR (tu sach)) ky ((nang x) OR (nang co)) hoi. lieu va nam thu hang thanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu kham) or (tu sach)) ky ((nang x) or (nang co)) hoi. lieu va nam thu hang thanh va cua tre*.