Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
tinh va » tich va, trinh van, tinh gia
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
ty nang » ky nang, ty xang, ty hang
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 x hoi. hieu van cam duc va ((tinh va) or (trinh vat)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang x hoi. hieu van cam duc va ((tinh va) OR (trinh vat)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang x hoi. hieu van cam duc va ((tinh va) or (trinh vat)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty nang x hoi. hieu van cam duc va ((tinh va) or (trinh vat)) cua te*.