Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
trinh van » trinh han, trinh quan, trinh toan
nhin viet » nhan viet, nghia viet, chinh viet
tu sach » thu sach, su sach, te sach
van cua » vang cua, ban cua, dan cua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. ((hieu viec) or (nhin viet)) cac ((xuc va) OR (luc va)) trinh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu viec) OR (nhin viet)) cac ((xuc va) OR (luc va)) trinh van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu viec) or (nhin viet)) cac ((xuc va) OR (luc va)) trinh van cua tre*".