Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
dau tuc » dao tuc, cau truc, dau nuoc
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
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: tu sach ty nang x hoi. hieu van ((dau tuc) or (dau tu)) va hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu van ((dau tuc) OR (dau tu)) va hanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu van ((dau tuc) or (dau tu)) va hanh tai cua te*.