Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va danh » va dinh, va hanh, dia danh
va dan » ca dan, va dao, va dau
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: su sach ty nang xa hoi. ((hieu ve) or (lieu va)) pham duc ((va danh) OR (va dan)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu ve) OR (lieu va)) pham duc ((va danh) OR (va dan)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu ve) or (lieu va)) pham duc ((va danh) OR (va dan)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu ve) or (lieu va)) pham duc ((va danh) OR (va dan)) vi cua te*.