Perhaps you should try some spelling variations:
hang thanh » hoang thanh, thang thanh, dang thanh
van pham » san pham, van phan, van phat
thu hang » thi hang, thuc hanh, thu huong
thanh va » thanh van, hanh va, thanh ha
vu khac » vu kham, vu khanh, bui khac
su sach » so sach, vu sach
va pham » va phat, va phap, va phan
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khac) or (su sach)) ky nang x hoi. lieu ((va pham) OR (van pham)) thu hang thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khac) OR (su sach)) ky nang x hoi. lieu ((va pham) OR (van pham)) thu hang thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khac) or (su sach)) ky nang x hoi. lieu ((va pham) OR (van pham)) thu hang thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khac) or (su sach)) ky nang x hoi. lieu ((va pham) OR (van pham)) thu hang thanh va cua tre*.