Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh lai » hanh lam, hanh tai, thanh lap
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
su sach » so sach, vu sach
van hai » van ha, van chat, van hanh
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
xuc va » tuc va, luc va, xac va

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 nang xa hoi. hieu van hai ((xuc va) OR (duc va)) ((hanh lai) or (hanh va)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu van hai ((xuc va) OR (duc va)) ((hanh lai) OR (hanh va)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu van hai ((xuc va) OR (duc va)) ((hanh lai) or (hanh va)) cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu van hai ((xuc va) OR (duc va)) ((hanh lai) or (hanh va)) cua viet*.