Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
tu tren » tu truyen, tu tieng, tu trong
o hoi » co hoi, o hoc, o hai
va tu » va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky nang ((o hoi) or (xa hoi)). hieu van ((cham soc) or (cam xuc)) va hanh va tu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang ((o hoi) OR (xa hoi)). hieu van ((cham soc) OR (cam xuc)) va hanh va tu tren.
• Adding a wildcard symbol may retrieve word variants: bo sach ky nang ((o hoi) or (xa hoi)). hieu van ((cham soc) or (cam xuc)) va hanh va tu tren*.