Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
quoc ban » quoc bao, quoc lan, quoc quan
te sach » toc sach
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, xuat ban
va cam » va cham, va cac, va cao
cua te » cua tu

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 ((ty nang) or (ty hang)) xa hoi. hieu va cam ((xuc ban) OR (quoc ban)) thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ty hang)) xa hoi. hieu va cam ((xuc ban) OR (quoc ban)) thanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (ty hang)) xa hoi. hieu va cam ((xuc ban) OR (quoc ban)) thanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ty hang)) xa hoi. hieu va cam ((xuc ban) OR (quoc ban)) thanh dai cua te*.