Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dung hai » dung tai, dung ha, dung sai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang
loc va » hoc va
luc va » duc va, tuc va
cua te » cua tu

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 y nang xa hoi. hieu van cam ((loc va) OR (luc va)) dung hai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu van cam ((loc va) OR (luc va)) dung hai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van cam ((loc va) OR (luc va)) dung hai cua te*.