Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
thi hang » thi hanh, thi nang, thi hong
thu hang » thuc hanh, thu huong, thu trang
vu khac » vu kham, vu khanh, bui khac
va pham » van pham, va phat, va phap
su sach » so sach, vu sach
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 ((thu hang) OR (thi 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 ((thu hang) OR (thi 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 ((thu hang) OR (thi 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 ((thu hang) OR (thi hang)) thanh va cua tre*.