Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
hanh vai » hanh vi, hanh va, hanh van
hanh tai » thanh tai, hang tai, han tai
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tu » cua tuc, cua su, cua cu
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: so sach ty nang x hoi. hieu van pham duc va ((hanh vai) OR (hanh tai)) ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang x hoi. hieu van pham duc va ((hanh vai) OR (hanh tai)) ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang x hoi. hieu van pham duc va ((hanh vai) OR (hanh tai)) ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang x hoi. hieu van pham duc va ((hanh vai) OR (hanh tai)) ((cua te) or (cua tu))*.