Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
danh dau » lanh dao, hang dau, danh tu
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
truc va » thuc va, trung va
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach ky nang xa hoi. hieu van chat ((truc va) or (thuc vat)) danh dau ((cua tu) OR (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ky nang xa hoi. hieu van chat ((truc va) OR (thuc vat)) danh dau ((cua tu) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ky nang xa hoi. hieu van chat ((truc va) or (thuc vat)) danh dau ((cua tu) OR (cua cu))".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky nang xa hoi. hieu van chat ((truc va) or (thuc vat)) danh dau ((cua tu) OR (cua cu))*.