Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
hieu te » hieu ve, hien te, hieu he
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va danh, ban hanh
te ban » te bao
ban co » ban do, san co
vi cau » va cau, ve cau, viet cau
di cau » da cau, diem cau
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu te ban co ((va hanh) or (va thanh)) ((vi cau) OR (di cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu te ban co ((va hanh) OR (va thanh)) ((vi cau) OR (di cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. hieu te ban co ((va hanh) or (va thanh)) ((vi cau) OR (di cau)) tren".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu te ban co ((va hanh) or (va thanh)) ((vi cau) OR (di cau)) tren*.