Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va nam » van nam, ha nam
di cuu » di cua, dinh cuu
di cau » da cau, diem cau
va nay » va ngay, va cay

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