Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cuu tac » cuu dac, cuu cac, cuu xac
tac vat » tap vat, tac va, tao vat
hanh te » hanh tu, hanh de, hanh he
hanh ve » hanh vi, hanh va, hanh kem
cua tuc » cua duc, cua tu, cua thuoc

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) or (lieu va)) cuu tac vat ((hanh te) or (hanh ve)) cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu van) OR (lieu va)) cuu tac vat ((hanh te) OR (hanh ve)) cua tuc.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu van) or (lieu va)) cuu tac vat ((hanh te) or (hanh ve)) cua tuc*.