Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh ca » thanh cha, thanh cac, thanh ha
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
tuc va » thuc va, tuc xa, duc va
ca cua » co cua
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: su sach ((y nang) OR (ly nang)) xa hoi. hieu van cau ((tuc va) or (truc va)) thanh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) xa hoi. hieu van cau ((tuc va) OR (truc va)) thanh ca cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ly nang)) xa hoi. hieu van cau ((tuc va) or (truc va)) thanh ca cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ly nang)) xa hoi. hieu van cau ((tuc va) or (truc va)) thanh ca cua te*.