Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cac tuc » cac toc, cac tac, cac nuoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
ty nang » ky nang, ty xang, ty hang
cac tu » cac thu, cach tu, cac du
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang xa hoi. ((hieu ve) or (hieu va)) ((cac tuc) OR (cac tu)) va danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang xa hoi. ((hieu ve) OR (hieu va)) ((cac tuc) OR (cac tu)) va danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang xa hoi. ((hieu ve) or (hieu va)) ((cac tuc) OR (cac tu)) va danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang xa hoi. ((hieu ve) or (hieu va)) ((cac tuc) OR (cac tu)) va danh vi cua te*.