Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh ha » thanh hoa, thanh hai, nhanh ha
va thanh » gia thanh, ban thanh, va tinh
ly quang » le quang, vu quang
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
tu sach » thu sach, su sach, te sach
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: tu sach ((ty nang) or (ly quang)) x hoi. hieu van cau duc va thanh ha ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ly quang)) x hoi. hieu van cau duc va thanh ha ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ly quang)) x hoi. hieu van cau duc va thanh ha ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ly quang)) x hoi. hieu van cau duc va thanh ha ((cua te) OR (cua tu))*.