Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cam » van nam, van lam, van cau
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cam tuc » cam xuc, cam tu, nam thuc
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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