Perhaps you should try some spelling variations:
tang thanh » dang thanh, trung thanh, hoang thanh
hieu van » hieu va, thien van, lieu va
duc tang » duc thang, duc tan, tuc tang
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van bao » van ban, van dao
bao duc » dao duc, bao luc, cao duc
vai cua » hai cua, lai cua, bai cua
y nang » ky nang, ly nang, v nang

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 xa hoi. hieu van bao duc tang thanh ((vai cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu van bao duc tang thanh ((vai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van bao duc tang thanh ((vai cua) OR (dai cua)) tre*.