Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » ban thanh, va tinh, le thanh
thai cua » than cua, tri cua, dai cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat

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 ky nang xa hoi. hieu van cau truc ((va thanh) or (gia thanh)) ((thai cua) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van cau truc ((va thanh) OR (gia thanh)) ((thai cua) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van cau truc ((va thanh) or (gia thanh)) ((thai cua) OR (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van cau truc ((va thanh) or (gia thanh)) ((thai cua) OR (tai cuc)) tre*.