Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
sach ty » sach y, sach tu, sach thu
vai cua » hai cua, lai cua, bai cua
truc va » thuc va, thuc vat, trung va
xuc va » duc va, tuc va, luc va

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 xa hoi. hieu van cau ((xuc va) or (truc va)) hanh ((vai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van cau ((xuc va) OR (truc va)) hanh ((vai cua) OR (dai cua)) te.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van cau ((xuc va) or (truc va)) hanh ((vai cua) or (dai cua)) te*.