Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
nam duc » nam duoc, pham duc, nam thuc
duc van » duc va, duc tan, duc manh
lai cua » hai cua, lai chau
y nang » ky nang, ly nang, v nang
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: tu sach y nang x hoi. hieu van nam duc van hanh ((((lai cua) or (thai cua))) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu van nam duc van hanh ((((lai cua) OR (thai cua))) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu van nam duc van hanh ((((lai cua) or (thai cua))) or (dai cua)) tre*.