Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
thu sach » tu sach, thuat sach, thuoc sach
van lam » van nam
tuc van » thuc van, truc van, tuc va
te sach » toc sach
van cam » van nam, van cau, van dam
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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 (thu sach)) ky nang ma hoi. hieu ((van cam) OR (van lam)) tuc van thanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky nang ma hoi. hieu ((van cam) OR (van lam)) tuc van thanh di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky nang ma hoi. hieu ((van cam) OR (van lam)) tuc van thanh di cua vat".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky nang ma hoi. hieu ((van cam) OR (van lam)) tuc van thanh di cua vat*.