Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tai khoa » da khoa, noi khoa
tu sach » thu sach, su sach, te sach
dat cua » dai cua, day cua, mat cua
dat cuu » dat cau
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((tai khoa) or (lai hoi)). hieu ve cam xuc va thanh ((dat cuu) OR (dat cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((tai khoa) OR (lai hoi)). hieu ve cam xuc va thanh ((dat cuu) OR (dat cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((tai khoa) or (lai hoi)). hieu ve cam xuc va thanh ((dat cuu) OR (dat cua)) tre*".