Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
lieu van » lieu va, hieu van, sieu van
van giao » nang giao, toan giao, dan gian
tan hanh » tang hanh, toan hanh, tran hanh
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
bai cua » ban cua, bai ca, hai cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang x hoi. lieu van giao duc ((tan hanh) OR (tan thanh)) ((bai cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang x hoi. lieu van giao duc ((tan hanh) OR (tan thanh)) ((bai cua) or (dai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang x hoi. lieu van giao duc ((tan hanh) OR (tan thanh)) ((bai cua) or (dai cua)) tre*.