Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
thanh va » thanh van, hanh va, thanh ha
ty nang » ky nang, ty xang, ty hang
duc gia » quoc gia
ly hang » ly quang
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
va cua » va chua, via cua, ca cua
cua te » cua tu
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: ((te sach) OR (toc sach)) ((ty nang) or (ly hang)) x hoi. hieu van cau duc gia thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ty nang) OR (ly hang)) x hoi. hieu van cau duc gia thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((ty nang) or (ly hang)) x hoi. hieu van cau duc gia thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((ty nang) or (ly hang)) x hoi. hieu van cau duc gia thanh va cua te*.