Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
cam tuc » cam tu, nam thuc, dam thuc
te sach » toc sach
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 (thuoc sach)) ky nang ma hoi. hieu van ((cam tuc) OR (cam xuc)) van thanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ky nang ma hoi. hieu van ((cam tuc) OR (cam xuc)) van thanh di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ky nang ma hoi. hieu van ((cam tuc) OR (cam xuc)) van thanh di cua vat".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ky nang ma hoi. hieu van ((cam tuc) OR (cam xuc)) van thanh di cua vat*.