Perhaps you should try some spelling variations:
thi hoang » thai hoang, thi hong, thi hang
va trien » va truyen, va thiet, va tuyen
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chat cua
hieu cao » chieu cao, hieu cac, hieu ca
ty hoang » ty hang, huy hoang, duy hoang
hanh va » hang va, hanh vi
su sach » so sach, vu sach
va va » va van, va vua, va vai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty hoang) OR (thi hoang)) xa hoi. hieu cao ((chat xuc) or (chao xu)) van hanh va va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hoang) OR (thi hoang)) xa hoi. hieu cao ((chat xuc) OR (chao xu)) van hanh va va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hoang) OR (thi hoang)) xa hoi. hieu cao ((chat xuc) or (chao xu)) van hanh va va trien".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hoang) OR (thi hoang)) xa hoi. hieu cao ((chat xuc) or (chao xu)) van hanh va va trien*.