Perhaps you should try some spelling variations:
dau tieng » cau tieng, day tieng, mau tieng
dau tien » van tien
te sach » toc 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
va danh » va dinh, va dan, va hanh
danh bi » danh di, danh gia, danh bat
va cao » va co, va dao, va bao
tuc va » thuc va, truc va, tuc xa

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

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